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Mathematics Questions and Answers May 30, 2023

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What does standard deviation measure? Select one: a. Amount scores vary from the mean b. Amount scores vary from the range c. Amount scores vary from the mode d. Amount scores vary from the median

The company's cleaning service states that they spend more than 46 minutes each time the cleaning service is there. The company times the length of 37 randomly selected cleaning visits and finds the average is 46.5 minutes and the standard deviation is 5.2 minutes. At =0.02, what would be the outcome of a hypothesis test for this claim? Homework

The four steps are identify, check, calculate, and conclude A researcher is interested in determining whether environmental conditions (based on geographic location) may be linked with fidgeting and seat-time. An experiment is designed where random samples of 5 year old children are gathered from three different cities. The child was instructed to
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Please help with a similar problem 4:24 PM Wed Dec 16 67% K AA mathxl.com C + X P Take a Test - Nicole Santora Course Hero MAT-240-R2797 Applied Statistics 20EW2 Nicole Santora & | 12/16/20 4:24 PM Test: 8-3 MyStatLab: Final Examination Submit Test This Question: 10 pts 13 of 28 (13 complete) This Test: 280 pts possible Question Help Test the
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Which statement describes a feature of nonparametric tests? Group of answer choices Analysis of variance is an example of a nonparametric test They require that the variable be measured on the interval or ratio scale. They are more powerful than parametric tests They involve few assumptions about the shape of a variable's distribution

a) The actual demand of a product for six months are summarized in the table below Month ( t ) Demand D t 1 80 2 90 3 70 4 100 5 70 6 90 Compute the mean forecast errorFind three months weighted moving averages by assuming the weights, W 1 = 0.1, W 2 = 0.4 and W 3 = 0.5 ii Compute the mean forecast error Compute the mean square error (MSE) Compute

QUESTION 5 2) What is the critical value? QUESTION 6 3) Calculate the test statistic to 1 decimal place. QUESTION 7 4) What is your decision regarding the null hypothesis? a. Reject Null Hypothesis b. Do not Reject Null Hypothesis QUESTION 8 5) What is your conclusion? a. Sample data indicates that college students watch significantly fewer DVDs

XYZ diet pills are supposed to cause significant weight loss. The following table shows the results of a recent study where some individuals took the diet pills and some did not. Diet Pills No Diet Pills No Weight Loss 80 20 Weight Loss 100 100 We are interested in determining if the proportions of individuals who experienced weight loss with and

Group Statistics HOSPITAL N Mean Sid. Deviation Std. Error Mean Average Total Payments Spectrum Health Hospitals 162986 9706.9362026 7664.1835678 18.984132109 Saint Mary's Health Care 79 10816.607215 8541.4442167 960.98755447 Independent Samples Test Levene's Test for Equality of Variances 1-test for Equality of Means 95% Confidence Interval of
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Please explain this problem to me and pretend I know nothing. Thank you. \f
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Please help me solve this problem. There is (2) parts. Here is the complete question below. D Question 7 1 pts A research team was interested in whether the proportion of on-campus students who are returned missionaries is greater at BYU-Provo than at BYU-Idaho. The team collects a random sample of students at each school. They find that 40 out of
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I'm interpreting coefficient alpha's and understand the concept of scores ranging between 0 to 1.00 as well as the concept of observed measured error; however, in a particular section of the material where reliability findings are being discussed, the following statement appears: "he Achievement scale, with aStandard Error of Measurement

a) A researcher was interested in the relationship between the battery life (hours) of a smartphone, the number of apps open, the temperature ( Celsius) and the screen brightness (nits). (Note: "nits" is a measure of screen brightness). A random sample was collected and the following regression created. SUMMARY OUTPUT Brightness Residual Plot
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how can i answer this please using logs The following is a linear trend fitted to a series expressed in logs. log(Tt) = 4.1085 + 0.0258t where t is expressed in years. What is the annual growth rate of the trend in percentage? Round your answer to the nearest second decimal. The annual growth rate of the trend in percentage is
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answer the questions Kim Engineering Inc. is a large manufacturing company in British Columbia. A Human Resources consultant from Kim Engineering would like to know whether the average annual number of sick days taken by the employees significantly decreased after the new medical insurance package had been introduced in January 2020. Six people
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thank you! 3. Suppose we have n i.i.d., uniform(0,15) random variables. Place these random variables on the interval (0,t]. Let 0 = so
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VitaminD, whether ingested as a dietary supplement or produced naturally when sunlight falls upon theskin, is essential forstrong, healthy bones. The bone disease rickets was largely eliminated during the1950s, but now there is concern that a generation of children more likely to watch TV or play computer games than spend time outdoors is at

Say you're on a game show, and you're given the choice of three doors: Behind one door is a car; behind the others, goats. You pick a door, and the host, who knows what's behind the doors, opens another door than the one that you chose to reveal that it has a goat behind it. He then ask you whether you want to change your choice to the other

Use data from the following table to calculate the rate ratio to estimate the association between asbestos exposure and lung cancer death among current smokers and interpret the result. Asbestos Exposure Lung Cancer Deaths Person-Years High 299 47,269 Low 482 480,039 Fill in the blanks: The numerator is . The denominator is . After calculating the

I have attached the question that I need help with A regression analysis on predicting sales (in $1000) by using advertising (in $) resulted in the following least squares line: = 80,000 + 5x. This implies that an: O A. increase of $1 in advertising is expected, on average, to result in an increase of $80,005 in sales 0 B. increase of $5 in
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In a library box, are 8 novels, 8 biographies, and 8 war history books. If Jack selects two books at random, what is the probability that the two books are of different types? (3 marks)

Global Warming Listed below are concentrations (in parts per million) of CO2 and temperatures (in .C) for different years. CO2(X) 314 317 320 326 331 339 346 354 361 369 Temp(y) 13.9 14.0 13.9 14.1 14.0 14.3 14.1 14.5 14.5 14.4 a) Determine the regression equation. b) Determine the coefficient of determination and explain its meaning. c) Determine
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X (Introduction to Statistics)_(STAT-401 Mid Fall 2020)_(BS Forestry_(3rd Semester) - Copy (1) - Word (Product Activation Failed) File Home Insert Design Layout References Mailings Review View Tell me what you want to do.. Share Find * 86 Cut Times New Ro * 12 - A A Aa AaBbCcDc AaBbCcD
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An investigator measured the one-year cumulative incidence of measles, and during the same year, the one-year period prevalence of measles in the same closed population of 5,000 school-age children. Assume that: 1) each child can only acquire measles once during their lifetime; 2) some children have had measles in the past, but everyone is

HELP ME PLEASE to solve this problem! I keep getting the wrong answer. The following data are from a completely randomized design. Treatment A B C 163 146 126 142 158 122 169 129 137 144 146 141 148 137 152 170 136 126 Sample mean 156 142 134 Sample variance 163.6 103.6 130.8 a. Compute the sum of squares between treatments (to the nearest whole

Spicy foods and pain threshold are related (https://pubmed.ncbi.nlm.nih.gov/31783132/). Let's assume that this intriguing discovery leads us to ask how people deal with physical pain. The recruitment of participants is based on their inclination towards spicy cuisine (IV1). Participants in this method are divided into two groups: those who like
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A scientist wants to see if there is a difference in test scores between employees and students who don't work. students who do work: 52, 79, 79, 73 students who don't work: 93, 65, 62, 74, 77, 59, 63 answer the following questions using the info above What inferential statistics should you use? (1-7 choices) 1. z test 2. single sample t test 3.

When analyzing data to determine differences between groups, it is important that the researcher know if the data sets are independent or dependent on one another and make any needed adjustments in statistical calculations. An example ofindependent groups is: Group of answer choices Matched pairs of subjects used for the control and treatment

can you please assist me with this Suppose that the distribution of the number of items x produced by an assembly line during an eight-hour shift can be approximated by a normal distribution with mean value 150 and standard deviation 10. What is the probability that between 135 and 160 (inclusive) items are produced? Select one: O a. 0.7925 O b.
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The answer for the question please Thank 5 points Save Answer When six basketball players are about to have a free-throw competition, they often draw names out of a hat to randomly select the order in which they shoot. What is the probability that they shoot free throws in alphabetical order? Assume each player has a different name. Type an
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I have attached the question that I need help with The residual is defined as the difference between: O A. the actual value of y and the estimated value of x O B. the actual value of x and the estimated value of x O C. the actual value of y and the estimated value of y O D. the actual value of x and the estimated value of y
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Collect the sample and record the data. Use a single unit for height. Do not use a mixed unit like feet and inches. \f3. {CLD 2} Test a claim that the mean height of your population is di'erent from 64 inches. Use the appropriate signicance level o: you xed earlier. a. State the initial and alternative hypothesis. b. Find the test statistic and
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please help A doctor released the results of clinical trials for a vaccine to prevent a particular disease. In these clinical trials, 200,000 children were randomly divided in two groups. The subjects in group 1 (the experimental group) were given the vaccine, while the subjects in group 2 (the control group) were given a placebo. 0f the 100,000
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I have attached the question that I need help with If all the points for a multiple regression model with two independent variables were on the regression plane, then the multiple coefficient of determination would equal: OA. O OB. 1 O C. 2, since there are two independent variables O D. any number between 0 and 2
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Question 5 3 pts Use the summary statistics given for the birth weights of 195 girls: x =32.7 hg, s =6.6 hg Construct a 95% confidence interval level estimate of the mean. hg
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R14. Part 2/3 Price of eggs and milk: The following table presents the average price in dollars for a dozen eggs and a gallon of milk for each month from January through October 2004. Use a TI-84 calculator to answer the following. Dozen Eggs Gallon of Milk 0.94 2.85 0.89 2.76 1.03 2.85 0.88 2.89 0.92 2.91 0.86 2.93 0.93 2.89 0.92 2.94 0.92 2.95

Please help with questions (A-I) and also, find the upper and lower bound. Thank you. Six different national brands of chocolate chip cookies were randomly selected at the supermarket. The grams of fat per serving are as follows: 9; 9; 10; 7; 8; 8. Assume the underlying distribution is approximately normal. NOTE: If you are using a Student's
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What if the last three digits are 175. Please teach me the code. Gift cards have become a popular present. Retailers like these cards because they are easy to process and difcult to counterfeit. It has also been found that customers appreciate the convenience; the cards make great stocking stuffers and are easy to mail. We want to compare the
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Cough, cough The following table presents the number of days a sample of patients reported a cough lasting from an acute cough illness. 12 14 16 18 20 22 24 12 14 16 18 20 12 14 16 18 20 12 14 16 18 20 12 14 16 18 20 13 15 17 19 21 12 20 12 16 18 20 12 22 14 18 20 20 20 20 20 Send data to Excel Part 03 Part 1 of 3 (a) Construct a frequency
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Please help me solve this. Here is the complete question below Question 3 1 pts A random sample of temples of the Church of Jesus Christ of Latter-day Saints is obtained. Data is to be collected on each of the temples in the sample. Which of the following are examples of quantitative data that could be collected about the temples? (Select all that
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Random Variables. The following distribution represents a random variable (X) the number of homeruns hit in a 7 game baseball series and their respective probabilities. # of homeruns (X) Probability 1 0.21 2 0.24 3 0.38 4 0.08 5 0.06 6 0.03 a. Is this a valid probability distribution? If so, explain why. b. Find the expected number of homeruns in

8.21 Assume that the probability of breast cancer equals .01 for women in the 50-59 age group. Furthermore, if a woman does have breast cancer, the probability of a true positive mammogram (correct detection of breast cancer) equals .80 and the probability of a false negative mammogram (a miss) equals .20. On the other hand, if a woman does not

An article in Fire Technology investigated two different foam-expanding agents that can be used in the nozzles of firefighting spray equipment. A random sample of five observations with an aqueous film-forming foam (AFFF) had a standard deviation of 0.6. A random sample of five observations with alcohol-type concentrates (ATC) had a standard

2. A traffic engineering study on traffic delay was conducted at intersections with signals on urban streets. Three types of traffic signals were utilized in the study: 1) pre-timed, 2) semi-actuated, and 3) fully-actuated. Five intersections were used for each type of signal. The measure of traffic delay used in the study was the average stopped
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1. The following data is obtained from a population with a known variance of 9. 9.81 1491 19.39 10.63 14.80 20.73 25.23 8.32 15.83 19.26 [f the data is known to come from a Gaussian population, find the 95% confidence interval for the mean. 2. A random sample of size 10 is taken from a Gaussian population with mean y; and variance g2 = 225 yield
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Please help me solve this. Here is the complete question below. Question 16 1 pts A high school math teacher wants to know how long a particular homework assignment takes her students. She asks 50 randomly selected students in her current semester how long it took to complete the assignment. She finds that the sample data is right skewed. Are the
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Assume that when adults with smartphones are randomly selected, 47% use them in meetings or classes. If 7 adult K smartphone users are randomly selected, find the probability that at least 3 of them use their smartphones in meetings or classes The probability is (Round to four decimal places as needed.)
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Need Help. Thanks! 7. e 40.27 poinu BBUnderStaHZ 5.4.017. R My Notes 0 Ask Your Teacher A television program reported that the U.S. (annual) birth rate is about 23 per 1000 people, and the death rate is about 13 per 1000 people. (a) Explain why the Poisson probability distribution would be a good choice For the random variable r- number of births
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I have attached the question that I need help with A) If the researcher wants to see whether locating in different regions, namely, East Asia, Africa, and Latin America, affects the revenue incomes of countries in different regions, he can create dummy variables in the regression model. Which of the following can be a right way of doing so? O A.
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Please help me solve this problem, I have included all of the information below. Part 2: Based on the material taught in this course, which of the following is the most appropriate alternative hypothesis to determine if number of patients in the ER at time of admitting has a statistically significant linear relationship with length of stay in the
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The probability is? Assume that when adults with smartphones are randomly selected, 44% use them in meetings or classes. If 14 adult smartphone users are randomly selected, find the probability that fewer than 3 of them use their smartphones in meetings or classes. The probability is (Type an integer or decimal rounded to four decimal places as
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Please help A random sample of residents oni various income brackets were asked their opinion on tax reform for the country of Guyana The data so gathered were analyzed by a statistician and the results he obtained using IvNITAB are shown below: Expected counts are printed below observed counts Low Middle High Total For 26 75 14 115 {30.67}
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Suppose X is time to take a bar exam where X is from 0 to 8 hours where f(x) = x/32. Find the mean of X.

Now add the variable SkipClass as a predictor variable in the model (along with GPA). SkipClass is the number of classes student says he or she misses in a typical week. What is the evidence in the output that SkipClass is related to the probability of having ever cheated on an exam

The Systolic Blood Pressure (in millimeters) from a sample of patients has a mean of 125mm and standard deviation of 8 mm. Systolic Blood Pressure follows a normal distribution. What percentage of patients have a blood pressure greater than 110mm?

16% of all Americans live in poverty. If 33 Americans are randomly selected find the probability that A. Exactly 4 of them live in property B. At most seven of them live in property C. At least five of them live in poverty D. Between five and 12 (including 5 and 12 )of them live in property. Round each answer to four decimal places

abour 42% of coffee dri kers like decaf. a researcher suspects that percentage is different for those who.live in the inner city. of 215 who live in the inner city, 115 life decaf. find. test statistics and p value when a=0.25

For a three-question quiz where all questions are true/false, what is the probability that there all three answers will be true? a [image] b [image] c [image] d [image]

The following is a list of 14 measurements. 21, -14, -98, 43, -70, 46, -99, 77, 86, 37, 87, 82, 51, 54 5and data to calculator Suppose that these 14 measurements are respectively labeled x , Yes .... Xj4. (Thus, 21 is labeled > , 14 is labeled >, , and so on,) Compute the following. 14 [ (, + 43) 585 X 5 Try again
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Suppose Bob flips a fair coin 100 times. Let X be the number of heads he gets. What is the variance of X? Group of answer choices 50 5 None of the other choices is correct Not enough information to answer 25

Exercise 8.21 (Algo) METHODS AND APPLICATIONS Suppose that we will randomly select a sample of n = 84 elements from a population and that we will compute the sample proportion .57 of these elements that fall into a category of interest. If the true population proportion p equals .9: (a) Describe the shape of the sampling distribution of 13. Why
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Suppose the amount of a popular sports drink in bottles leaving the filling machine has a normal distribution with mean of 101.5 milliliters (mL) and a standard deviation of 1.6. If 36 bottles are randomly selected, find the probability that the mean content is less than 102.1 mL

A "Favorite Color" survey was completed among 800 children. a. 30% liked the color Blue, how many liked Blue? __________ b. 35% liked the color Green, how many liked Green? __________

16 Question 16 (1 point) The items produced by a manufacturer have a probability equal to 0.3 of being defective. For a random sample of 10 items, the probability that at most 3 items are defective as given by R is O pbinom(3,10,0.3) O pbinom(10,3,0.03) O 1-pbinom(3,10,0.3) O dbinom(3,10,0.3)
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The amount of toothpaste put into a tube has a normal distribution with mean 8 ounces and standard deviation 2 ounces. The tube itself could hold 10 ounces. What is the chance that the tube gets overfilled?

Which of the following is a definition for a point estimator? a The approximate number of items in a sample. b A single value that is used to approximate a population parameter. c An approximate confidence level for a proportion of a sample d An approximate number of people in a population

Arm circumferences of adult men are normally distributed with a mean of 33.64 cm and a standard deviation 4.14 cm. Describe the sampling distribution of a sample of 25 men. Indicate whether the distribution is normal and define the mean and standard deviation of such sampling distribution.

Why do we use the "t-distribution" in the Chapter 2? A.Because the "t-distribution" is always more precise than the normal distribution. B.We can choose arbitrarily the t-distribution or the normal distribution. Since in Chapter 1, we use normal distribution. For here, we use t-distribution. C. If we only have limited measurements, the normal

Alcohol withdrawal occurs when a person who uses alcohol excessively suddenly stops the alcohol use. Studies have shown that the onset of withdrawal is experienced a mean of 40 hours after the last drink, with a standard deviation of 19 hours. A sample of 38 people who use alcohol excessively is to be taken. What is the probability that the sample

According to the Central Limit Theorem, what is the minimum sample size that should be sufficient for most populations? a 10 b 15 c 25 d 30

Table t value at 95% confidence interval with 16 degrees of freedom is 2.12 2.06 2.11 1.96

Use StatCrunch to compute the following three summary measures for Variable 6, for each of the subsets for Variable 1 - the summary measure for Variable 6 such that 80% of those surveyed responded with values above this summary measure - the summary measure for Variable 6 such that one-quarter of those surveyed responded with values below this

how to use a two population hypothesis test to show that categorical and quantitative data are related

Question 28 10 pts A researcher conducts a study examining whether attending the Head Start program would make a difference in preschool children's social skills. One sample of preschool children attend the regular program as the control group and another sample of preschool children attended the Head Start program as the treatment group. The
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three students an athlete, a fraternity member, and an honor student, record the number of hours they slept each night for 20 nights. JMP Applet

Let X and Y have joint probability density function fX,Y (x; y) = Cy exp[-xy]1 {x>1;y>1} where C > 0 is an appropriate constant. a, Evaluate C, and then find the marginal probability density functions of X and Y . b, Find the conditional probability density function of X given that Y = y, where y in the range of (1;inf). Are X and Y independent?

Plagiarised answer will get unhelpful ating. I will check Explain in detail the general strategy for collecting data.

Ag O X secure.dialogtech.com/agentpanel.php?csrfl. DialogT x | 0 Mail - \\ x | Housto x | 20 Portal L x | myWak x | STAT-3 x | MyStat x | Course x Do Hor X OPEN F - C ( mathxl.com/Student/PlayerHomework.aspx?homeworkld=5468370498questionld=4&flushed=false&cld=5733650&back=DoAssignments.aspx 10/28/2019 Qualified VS ii Apps Log Into Your Finger.
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A company, that has a store within a major shopping center, wants to conduct a survey of a population. Because the population is large the company selects a sample asking customers who walk in the store if they would be willing to take part in a survey. What type error has the company made in selecting the sample? a Convenience sampling b Random

Q3 (4 points) Suppose that A and B are events in a sample space 9, both with positive probability. (a) [3 marks] Show that P(AIB) > P(A) if and only if P(BIA) > P(B) (b) [1 marks] Explain this result (not the proof) in words. Does this make intuitive sense? Why
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Please explain this problem to me, assume I know nothing about the subject. Thank you. \f
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Suppose Bob does a linear regression that will use cost of a product to the number of days before being purchased on Facebook marketplace. He finds there is a strong positive linear relationship and the regression line is Y = 7+.10X. Interpret the slope. Group of answer choices As price increases by $1, the number of days before being purchased

This dataset contains information on AIDS cases from a random sample of 113 countries from around the world. Researchers specifically want to know whether a measure of democratic rights (higher = more democratic) is related to the number of AIDS cases per 100,000 people

Please, give clear explanation to those questions. 2. Megan manages a company with 1000s of restaurants world wide. She is considering expanding in either the NW or the NE part of the USA. She has her financial department conduct a survey of weekly sales in the last year for both regions. The summary data is below (HINT: and shows similar
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An environmentalist wants to know if Brisbane houses are more likely to have refrigerated air conditioners than houses in other cities. He randomly selects 50 homes each from Brisbane, Melbourne and Sydney and records whether each home has refrigerated air conditioning, evaporative air conditioning or no air conditioning. What type of analysis

There are different guidelines for calcium intake for children age 5-10 those aged 11-13. A study was conducted to determine if children consumed an adequate amount of calcium and yielded the following results. Met requirements Age 5-10 Age 11-13 No 194 557 Yes 861 417 Test the null hypothesis that there are no differences between the two age

Suppose that the longevity of a light bulb is exponential with a mean lifetime of eight years. Find the probability that a light bulb lasts less than one year.

Suppose X is binomial. If p = .3, how big does n have to be in order to use the normal approximation to answer a probability question? Group of answer choices 34 15 33.33 14.29

A data set has a skewed left distribution with a mean of 88 and a standard deviation of 40. We take 10,000 samples of size 40 from this distribution. The sampling distribution of sample means will have a) A mean = ________ b) standard deviation = ____________ c) What shape distribution? ________

A student has an average of 86% on the unit tests, 85% on the final test, 90% on the class project, and 92% on homework submissions. If the unit tests count for 25% of the final grade, the final test counts for 40%, the class project counts for 15%, and homework submissions count for 20%, what is the weighted average grade of the student? a.) 88%

Helpful references about this question: Chi-Square Tests, The Chi-Square Statistic and the Chi-Square Test for Goodness of Fit, The Chi-Square Test for Independence, Assumptions for the Chi-Square Tests, Effect Size and Power for the Chi-Square Tests for Independence, Strategies for Hypothesis Testing When Population Distributions Are Not Normal,

This data was looked at closely by ethnicity: Of the total 1137 polled, 656 of the 1093 caucasians said they believed abstienece programs are effective, while 481 of the 868 African Americans said they believed abstienece programs are effective. State a Plus 4 95% confidence interval for the difference proportion between caucasians and afterican

A researcher conducts an experiment comparing four conditions with n = 9 participants in each condition. Source SS df MS Between treatments Within treatments 10 Total 500 What does the SS for the between treatments equal? (hint: start with the values for df)

The average time to manufacture a product is normally distributed with a mean of 34 days and a standard deviation of 6 days. a) Find the probability it will take more than 39 days to manufacture the product? b) Find the probability for the average manufacturing time for a sample of 10 of these products to exceed 39 days? c) Why is your answer for

A machine that fills milk cartons is set up to a Mean of 32.4 oz. per carton, with a Standard Deviation of .2 oz. What is the probability (percentage) that a filled carton will contain Less than 32 oz. of milk? ____________

A citrus farmer who grows oranges finds that the diameters of oranges harvested follow a normal distribution with a mean diameter of 5.80 cm and a standard deviation of 0.24 cm. Find the probability (percentage) that a randomly selected orange has a diameter between 6.0 and 5.4 cm. ____________

In a random sample of 49 audited estate tax returns, it was determined that the mean amount of additional tax owed was $3496 with a standard deviation of $2599. Construct and interpret a 90% confidence interval for the mean additional amount of tax owed for estate tax returns. Click here to view the standard normal distribution table (page 1).
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A household refrigerator has an expected life that is normally distributed with a mean of 24 years and a standard deviation of 5 years. a) Find the probability a fridge will last over 30 years? b) A manufacturer wants to offer a warranty on this fridge (meaning they will replace it for free if it does not last this long) so that only 1.04% of the

Complete the table for Standard Deviation: Data Data-Mean (Data - Mean)- 51 63 71 82 98 Total
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- 1 of 3ID:MST.FET.PD.BD.01.0020A An analyst has been studying a particular stock and has come to the following two conclusions: the probability that the stock will rise on a particular day is 0.3 the rise or fall of the stock on any particular day is independent of the rise and fall of the stock on any other day Calculate the probability that

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