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Mathematics Questions and Answers January 15, 2022

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1. Why use feature selection? If two predictors are highly correlated, what is the effect on the coefficients in the logistic regression? What are the confidence intervals of the coefcients? 2. K- mean and Gaussian mixture model: what is the difference between K-mean and EM? 3.How to decided k? 4.When using Gaussian mixture model, how do you know
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Suppose you have an exponential looking histogram, and you find a linear pattern when you look at log(frequency) vs log(x). Find the mathematical form of the frequency vs x (FYI. these histograms are said to follow "powerl-ow." There are lots of variables that have power-law histograms, including) x= magnitude of earthquakes = population of

Which features are significant at an alpha level of 0.001 ? Which features are significant at an alpha level of 0.001 ? MarriedYes, StudentYes, Cards Rating, Limit, EthnicityAsiam Income, Age, Rating, Education Income, Limit, Cards, StudentYes

Please help me understand and solve this problem. How do get the difference between these two populations? Score: 0 of 3 pts 2 of 9 (6 complete) HW Score: 17.38%, 7.13 of 41 pts 11.1.13 Question Help Construct a confidence interval for p, - p2 at the given level of confidence. X1 = 355, ny = 537, x2 = 422, n2 = 565, 95% confidence The researchers
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Side panel YORKVILLE UN Ask YU MyYU BUSI 1013 Statistics for Business 11/11(18W- O-C) Home My courses BUSI1013-18W-O-C Unit 11: Final Examn 19 March - 25 March Final Exam Started on Saturday, 24 March 2018, 2:38 PM State Finished Completed on Saturday, 24 March 2018, 5:19 PM Time taken 2 hours 40 mins Grade 65.00 out of 72.00 (90%) Question 1
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The bearing from the Pine Knob fire tower to the Colt Station fire tower is N 650 E, and the two towers are 36 kilometers apart. A fire spotted by rangers in each tower has a bearing of N 80' E from the Pine Knob and $ 70 E from Colt Station (see figure). Z Colt Station 70 80 Fire 650 Pine Knob Not drawn to scale Find angles A, B, and C (in
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Select the incorrect statement Question 21 Select one: a. Pie charts are used for showing percentages b. Map charts are used for showing geocoded data c. Bar charts are used for comparing data across categories d. Line charts are used for viewing trends in data over time

Suppose 41% of recent college graduates plan on pursuing a graduate degree. Twenty recent college graduates are randomly selected. a. What is the probability that no more than three of the college graduates plan to pursue a graduate degree? (Do not round intermediate calculations. Round your final answer to 4 decimal places.) b. What is the

The Bureau of Labor Statistics reported that the average yearly income of dentists in the year 2017 was $110,000. A sample of 81 dentists, which was taken in 2019, showed an average yearly income of $120,000. Assume the standard deviation of the population of dentists is $36,000. a. We want to test to determine if there has been a significant

Assume that a sample is used to estimate a population mean . Find the margin of error M.E. that corresponds to a sample of size 19 with a mean of 85.8 and a standard deviation of 16.3 at a confidence level of 99%. Report ME accurate to one decimal place because the sample statistics are presented with this accuracy. M.E. = Incorrect Answer should

(a) Describe briefly two examples of probability distributions you know. [4 Marks] (b) List three characteristics of a Binomial distribution. [3 Marks] (c) Let A and B be events such that P (A) = 0.7, P (B) = 0.6 and P (AUB) = 0.8. Find P (AnB) and P (A'nB). [8 Marks] (d) The random variable X has the following distribution for x = 1,2,3,4. X 2 4
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Select the statement that is TRUE. The interquartile range covers 100% of adata set. The interquartile range is the average value of a data set. The interquartile range is calculated by subtracting the first quartile from the third quartile. Theinterquartilerange is calculated by adding the first quartile with the third quartile.

it has been estimated that the total production of oil from a certain oil well is given by T(t)=-1000(t=10)e^-0.1t +10000 thousands barrels t years after production has begun. Determine the year when the oil well will be producing at maxium capacity

3.The probability that machine A will be performing a useful function in five years time is 0.25, while the probability that machine B will still be operating at the end of the same period is 0.33. find the probability that, in five years time15 Marks i.Both machines will be performing a useful function ii.Neither will be operating iii.Only

a 32-year old caucasian lady presents to you wanting a tattoo removed using laser and asks you to give here a percentage

Our club has25 members, and wishes to pick a president, secretary, and treasurer. In how many ways can we choose the officers, if individual members are allowed to hold2but not all 3offices?

Which is true of widowed men and women? Group of answer choices Number of widowed men is more than women No one keeps track of this information Number of widowed men is the same as women Number of widowed women is more than men

= 0.75 X 0.40 = 0.3 - P(A) The probability of being on the winning playing basketball. Calculate the complementary event of P(A) to find the probability of not being on the winning team. = 1 - 0.3 = 0.7 - P(A') The probability of not being on the winning team playing basketball

A community college has 7656 students currently enrolled in classes. To gain thestudents' opinions about an upcoming buildingproject, the college president wishes to obtain a simple random sample of 8 students. He numbers the students from 1 to 7656. Complete parts(a) and(b) below. Part 1 (a) Using the provided random number table, the president

In a study of the accuracy of fast food drive-through orders, Restaurant A had 340 accurate orders and 68 that were not accurate. a. Construct a 95% confidence interval estimate of the percentage of orders that are not accurate. b. Construct the results from part (a) to this 95% confidence interval for the percentage of orders that are not

In general, the ______ more thoroughly reports on crime/victimization rates than the ______ because it does not rely on victims to proactively approach the police to report their victimization

Set your utility for $0 to be 0 and$1 million to be 100.Apply the simple decision tree used in determining your utility for money, where the lottery has a prize of $1 million if you win and $0 if you lose, to determine your utility for $500,000 and $200,000.Use these 4 utilities to draw your utility curve for money.

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(8 pts) To better understand how each age group spends on health, construct the 95% confidence interval for the average health dollars in each of the age groups across all years. This will be seven confidence intervals total. Round your answers to three digits. What can be concluded about the average amounts of health dollars spent across these

Eyeglassomatic manufactures eyeglasses for different retailers.They test to see how many defective lenses they made in a time period.Table #4.2.2 gives the defect and the number of defects. Table #4.2.2: Number of Defective Lenses Defect type Number of defects Scratch 5865 Right shaped - small 4613 Flaked 1992 Wrong axis 1838 Chamfer wrong 1596

A theater group holds a fund-raiser. It sells 100 raffle tickets for $8 apiece. Suppose you purchase four tickets. The prize is two passes to a Broadway show, worth a total of $150. part(a) List the values that X may take on. A 1,2,3,4 B -32,118 Part (d) Construct a PDF. (Round your answers to two decimal places.) X p(X=X) x*p(x=x) Profit

The American Shorthair Cat is a popular breed of house cat. They have a mean weight of 11 pounds with a standard deviation of 1.5 pounds. The French Bulldog is a popular breed of dog. They have a mean weight of 22 pounds with a standard deviation of 3 pounds. A household has one of each of these pets. Their American Shorthair Cat weighs 13.75

A box contains red and blue marbles; there are fewer red marbles than blue ones. Marbles are drawn one at a time from the box at random with replacement. you win a dollar if a red one is drawn more often than a blue one there are two choices (a) 100 draw are made from the box (b) 400 draws are made from the box Choose one of the options below and

(a) Y = 1 n Pn i=1 Yi is N(, 2 ). (b) Y = 1 n Pn i=1 Yi is N(, 2/n). (c) Y / n N(0, 1). (d) Y S/ n N(0, 1). (e) Y S/ n tn1. (f) Y and S are independent. (g) S 2 has a 2 distribution. (h) Y S/ n 2 has an F distribution

Descriptive and inferential statistics have distinct roles in the analysis of research results. It is essential for counselors to understand the purpose of both types of statistics and to identify the characteristics of each in research literature. For this week's assignment, carefully read the article on group meaning-centered hope therapy.
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a . What's the probability none of the 36 statistics / biostatistics Ph. D.s are women
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At the present time, the Maori make up less than _____ percent of the population of New Zealand

Part 5: Peer Challenge 5. Create your own complex number in rectangular form: Rectangular form: Exchange with a classmate and ask them to convert it to polar form. Your classmate's answer: Reflection: How did the process of converting your complex number help deepen your understanding of the relationship between the two forms
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How do I create the below? I have prices from 10 stations in my area and I am not sure how or what to use for the demand curve. Identify 10 gas stations in your local area. Record the price per gallon for each gas station. Research supply and demand curves for gasoline. Create an Excel spreadsheet in which you do the following: Create a supply

Let f(x)=4x-1, h(x)=x-3 Find (f o f)(3) The little o is the o symbol in calculus, I just don't have it on my keyboard :)

Imagine you are reading a research article about a study that was done, and was analyzed with an Independent-Measures ANOVA. If the ANOVA Source table and the F-critical are as follows, which APA sentence below is correct? F-critical = 4.07 (found using =.05) SOURCE SS df MS Fobt Between 75.58 3 25.19 21.60 Within 9.33 8 1.17 Total 84.92 11 Group

Research on the results of laboratory and field experiments that examine the same variables suggest: Question 17 options: similar results dissimilar results independent variables in the field experiments studies in laboratory experiments not be conducted in a natural setting

The Ball corporation's beverage can manufacturing plant in Fort Atkinson, Wisconsin, uses a metal supplier that provides metal with a known thickness standard deviation 0=.000821 mm. Assume a random sample of 45 sheets of metal resulted in an X=.1503 mm Calculate the 90 percent confidence interval for the true mean metal thickness, round to 4

Introduction: This learning lab is very similar to last week's learning lab. We will look at the same data but now analyze them as if they came from a study in which each individual completed every condition. After performing the analyses, you will compare the results to the results we obtained in the previous learning lab. The goal of this
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Question 9 The following table shows hypothetical information about the US's Screening of Passengers by Observation Techniques (SPOT) program aimed at finding terrorists before they board planes. Not Terrorist Terrorist Not Suspicious 1,980,000,000 1 Suspicious 20,000,000 99 Use Bayes\" Rule to calculate Pr(Terrorist|Suspicious). \f
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Select the bestSelect the best response. We took a simple random sample (SRS) from a population to study the effect of marital status (married vs. not married on systolic blood pressure. Which t procedure should we use? a one-sample t-test procedure a paired t-test procedure ANOVA none of the above response. The sampling distribution of means will

I have a data frame called 'Top_Chef', which is a reality show. It has the columns 'Contestant ID', 'Number of Season', 'Contestant Name'', 'Date of Birth', 'Personality Type', and 'Total Number of Days on the Show'. I want to find the 'Contestant Name' that had the most total number of days on the show 'Top_Chef'. If a contestant appeared on more

In a recent survey of homes in a major Midwestern city, 30% of the homes have a fax machine and 75% have a personal computer. Suppose 15% of the homes have both a fax machine and a personal computer. What is the probability that a randomly selected home does not have a fax machine or does not have a personal computer?

One of the ways results from a sample-based study may be used is ______. Group of answer choices to prove that one variable causes a change in another to infer if a relationship found in a population exists for an individual to understand very rare phenomena in depth to infer if a relationship found in a sample represents a relationship that

3. Let X and Y have the joint distribution Y\\X'-1 1 2 2 0.10 0.35 0.20 3 0.05 0.20 0.10 i.e. P(Y = 2 and X = 1) = 0.10. (a) Find the conditional distribution of Y given X : 32', and compute the mean of this distribution E[Y|X : .713], for ac : 1,1,2. (b) Is it true for this distribution that E [YlX : cc] is a linear function of :13? (0) Compute
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Determine whether each of the following variables is quantitative (numerical) or qualitative (categorical). Then drag the variables into the appropriate category. Item Bank 2010 SuperBowl VIP MemorialDay Wholesale Group Rate PayDay NewYears Christmas TotalRewards SpecialEvent Thanksgiving 2012 FreeIndependent

An electronics manufacturer tests its capacitors for leakage current X at the maximum specified voltage. If X is below 20 pA, the capacitor is declared good (event G). If X is above 30 pA, it's declared bad (event B). Capacitors with leakage between 20 and 30 pA are declared marginal (event M). 95% of the capacitors have dielectrics that are free

Evaluation research can involve any of a number of research designs, including experimental and quasi-experimental designs. One of the following scenarios is an example of an experimental design, whereas the other is an example of a quasi-experimental design. Scenario 1 Hannah is comparing six relatively similar school campuses on the number of
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Values are uniformly distributed between175and260. * (Round your answers to 3 decimal places.) ** (Round your answer to 1 decimal place.) (a) What is the value of f ( x ) for this distribution? * (b) Determine the mean of this distribution: ** (c) Determine the standard deviation of this distribution: * (d) Probability of ( x >245) = * (e)

Design a Health Services Research Study, Question 1 Question Content Area INTRODUCTION: Ignacio is designing a study to determine if there is a correlation between patients' quality of life at home and their recovery rate from hip replacement surgery. His theory is that patients who consider themselves to have a higher quality of life are likely

Please find the questions attached below. b) Pose 2 probability questions based on the contingency table below, and answer your questions. The contingency table for inches of precipitation last year in Cincinnati: inches snow inches rain January 3.2 3.0 February 3.4 2.8 March 1.8 4.0 April 0.2 3.9 May O 4.9 June 0 4.0 July 0 3.8 August 0 3.4
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c. Find the probability the first person to use the ATM after 10:00 does so after 10:03
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PLEASE SOLVE THE FOLLOWING QUESTION PLEASE. SHOW ALL THE STEPS. 1. Forty-five specimens of a certain type of powder were analyzed for sulfur trioxide content. Following are the results, in percent. The list has been sorted into numerical order. 144 148 150 154 15? 164 143 14.4|14.8 | 150 | 15.4 | 15.9 164 (a) Construct a stem-and-leaf plot for
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Se le aplica a los indicios con el fin de controlar y realizar el registro de quin o quines entran en contacto y no pierda valor probatorio: Pregunta 4Respuesta a. Examen de cadaver. b. Cadena de custodia. c. Toma de muestras. d. Necropsia/autopsia

A study of the effects of color on easing anxiety compared anxiety test scores of participants who completed the test printed on either soft yellow paper or on harsh green paper. The scores for five participants who completed the test printed on the yellow paper were 17, 19, 28, 21, and 18. The scores for four participants who completed the test

Compare the analyses between the two studies. How does the unusualness of the observed statistic compare between the two studies? Does this make sense based on the value of the observed statistic in the two studies? Does this make sense based on how the two studies were designed? Explain. (Hint: Why might the results differ for human and

Date: True or False - write in the whole word, not just T or F [5 marks] You must explain proper logic or find a counter example for full marks. If a counter example is not practical please correct the error. So please explain why your answer is correct. 4. Function f(x) = 2vx and its derivative, will have the same domain. 5. The best way to
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Snow avalanches can be a real problem for travelers in the western United States and Canada. A very common type of avalanche is called the slab avalanche. These have been studied extensively by David McClung, a professor of civil engineering at the University of British Columbia. Suppose slab avalanches studied in a region of Canada had an average

1.A salesperson claims that more than 40% of the people that come into the store make a purchase. To test this claim, the store manager selected a sample of 100 people in the store and found that 47 made a purchase. State the p-value for the test accurate to 4 decimal places. 2.A certain lottery claims that at least 10% of its tickets win some

Biomedical Products anticipates sales of 61,000 units for the first six months of the year. Beginning inventory is maintained at 14 percent of anticipated sales. Ending inventory will be equal to 18 percent of the projected sales of 73,000 units for the last six months of the year. How many units should the firm produce during the first six months
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Please solve these questions from A to I step by step Suppose you ask 100 people their age and what they prefer to drink at lunch and record the results in the table to the right. Find the following probabilities. a) P(soda) b) P(40-49) c) P(30 or older) d) P(soda or coffee) e) P(coffee or 20-29) f) P(coffee and 20-29) g) P(soda|30 ? 39) h) P(50 ?
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Time series data are data collected at the same time period. True False

You are given the sample mean and the population standard deviation. Use this information to construct the90% and95% confidence intervals for the population mean. Which interval iswider? A random sample of 38 gas grills has a mean price of $ 638.80 . Assume the population standard deviation is $ 55.80 . 90% = ( , ) 95% = ( , )

: There are four candidates in an election. The election comprises of two voting stages, morning and afternoon, and there are 100 votes for each stage. Denote yij as the vote number of Candidate j at stage i, i = 1, 2 and j = 1, 2, 3, 4. However, an accident occurs during the vote counting such that we only know that the vote number of some
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A psychologist studying human memory would like to examine the process of forgetting.One group of subjects is required to memorize a list of words in the evening just before going to bed.Their recall is tested 10 hours later in the morning.Subjects in the second group memorize the same list of words in the morning, and then their memories are

For the Seashell gas station in yourneighbourhood, records indicate that the number of customers arriving in any5-minute interval averages 0.94customers, with a standard deviation of 0.97 customers. Sixty-five (65) percent of the customers use a credit card to pay for their purchase. There are 8 pumps at this service station. The time that a car

Select all that apply Dot plots can show which features of a data set? Multiple select question. Center Shape Variability Data entry errors

Which of the following numerical values is a parameter? Group of answer choices Of a company's employees, the opinion of those who work from home on a specific recommendation. In a study of home values in Florida in 2021, the average increase of homes near the college. In a study of final test grades of the students in a specific class, the range

Relative Ratings of Fish Caught (make us of z-scores) In a certain lake, the trout average 12 inches in length with a standard deviation of 2.75 inches.The bass average 4 pounds in weight with a standard deviation of 0.9 pound. If Tobi caught an 18-inch trout and Katrina caught a 6-pound bass, then relatively speaking, which catch was the better?

Wins Number Wire Price Score Rating 52 10 10 Good Chardonay Lingha 208 32 17 Wary Good Fiveris Large Whis XD8 31 Very Good 55 325 0 Chauic Alowreis Roccha dal Anmurciata SONG 42 35 I Very Good 440 Ha Wary Good Barbara d' Aba La Garbaraja NOT 35 17 Very Good Langhe White Cinarino S81 38 1 Wary Good 20 I Very Good 25 a Very Good Pasa Again Vile del
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Question 1 (1 point) Answer the question True or False. Measurement is the process of assigning numbers to variables of individual population units. Question 1 options: True False Question 2 (1 point) Solve the problem. Parking at a large university has become a very big problem. University administrators are interested in determining the average

4. (10 points) Let X1, X2, ..., Xn be i.i.d. random sample with finite mean /, let Y = > Xi and assume X; comes from Poisson distribution, then X = - is approximately N (, " ) Y for n n large n. Show that the variance Var does not depend on /. Hint: You will need delta theorem for this
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Data are uniformly distributed between the values of 6 and 14. (a) Determine the value of f ( x ). What are the mean and standard deviation of this distribution? (b) What is the probability of randomly selecting a value greater than 11? (c) What is the probability of randomly selecting a value between 7 and 12? (Round your answers to 3 decimal

Suppose a random sample of adult women has a sample mean height of 64.3 inches, with a sample standard deviation of s = 2.4 inches. Since height distribution are generally symmetric and bell-shaped, we can apply the empirical rule. Between what two heights are appropriately 99.7 % of the data

4. The text website has a data file (created from data at www . basketball-reference . com showing, for each game in 2010-2011 season of the National Basketball Association in which Rajon Rondo of the Boston Celtics played, x = the number of assists he recorded and y = whether the Celtics won (1=yes). Using SAS, or other software, (a) show that
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The mean of a probability distribution is called the Group of answer choices expected value of the mean and mathematical expectation mathematical expectation expected value of the mean none of these

a. the average content of colognes in the long run b. the standard error of the mean c. a statistic d. a parameter

In a study done on the life expectancy of 500 people in a certain geographic region, the mean age at death was 72 years and the standard deviation was 5.3 years. What is the probability that an individual selected at random will be between 70 and 90 years old at death?

A bootstrap sampling distribution was constructed for a single mean. The sample mean was 100 and the standard deviation was 15. Given a sample size of 30 the standard error was 2.739. If the sample size were increased to 500, how would the standard error change? Group of answer choices It would increase. It would stay the same. It would decrease.

The relationship between height (in inches) and gender was estimated as below in a linear format. (Male was coded as 0 and Female was coded as 1.) Height = -7.22 * Female 69.71 (The p-value for the coefficient of Female is 0.03.) Base on the above equation, which of the following statements are true? Select all that apply. There can be more than

Fivethirtyeight pollster ratings take into account both process and outcomes

In[ 1: Step 1: Generating sample data This block of Python code will generate a unique sample of size 50 that you will use in this discussion. Note that your sample will be unique and therefore your answers will be unique as well. The numpy module in Python allows you to create a data set using a Normal distribution. Mote that the mean and
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Franklin Joiner, director of health, education, and welfare, had just left a meeting with the state's newly elected governor and several of the other recently appointed department heads. One of the governor's campaign promises was to try to halt the rising cost of the state's entitlement program. In several speeches, the governor indicated the

Which of the following is NOT appropriate when considering student-TA relationships? Question 9 options: If a student has routinely missed tutorial, reach out and personally counsel them, assuming they are in distress. If a student has routinely missed tutorial, reach out and help them to connect with relevant support services, as needed. If

Does the presence of small numbers of weeds reduce the yield of corn? Lamb's-quarter is a common weed in corn fields. A researcher planted corn at the same rate in 8 small plots of ground with, then weeded the corn rows by hand to allow no weeds in 4 randomly selected plots and exactly 3 lamb's-quarter plants per meter of row in the other 4 plots.

Considering the assertion about the value of a population parameter, what is typically being assessed in a hypothesis test? a. The probability of the sample data occurring by chance. b. The ethical considerations in collecting sample data. c. The accuracy of the population parameter as estimated from sample data. d. The validity of a theoretical

BIO Point Center Sampling: Tree Density 43.88 Trees/hectare 10,000 m2/mean area Table 3: Species Specific Computations Use the instructions below and/or in the Powerpoint to complet the computations. You will be determining relative frequency (species composition). Species # of Trees Relative Density (%) Density # Points Frequency of tree species

BIO Point Center Sampling: Species Specific Computations Use the instructions below and/or in the Powerpoint to complet the computations. You will be determining relative frequency (species composition). Species # of Trees Relative Density (%) Density # Points Frequency of tree species in sample Relative Frequency (%) Sweet gum 4 Hornbeam 3

Find an equation of the tangent line to the graph of the function f defined by the following equation at the indicated point. ( x - y -1) 3 = x ;(1,-1)

Recall the (make-believe) matched-pairs investigation of the effect of drinking two beers on reaction time in a driving simulator. We set a significance level of 5% and tested the following hypotheses. : Drinking 2 beers has no effect on reaction time. : Drinking 2 beers slows reaction time. We defined as the mean of the difference in reaction

Math 215 Statistical Concepts 1. 5. A. Is this a test for a difference in two population proportions or two population means? If two population means, are the samples dependent or independent? B. What distribution is used to conduct this test? C. Is this a left-tailed, right-tailed, or two-tailed test? State AND verify all assumptions required for
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Solve the logarithmic equation for x. Enter your answers as a comma-separated list. log 8 (x+4)+log 8 (3)=log 8 (9)+log 8 (2x-7)

Find the standardized test statistic for a hypothesis test from a sample with n = 10 , overline x =7.2,; s = 1.3 , and alpha = 0.05 if mu >= 8.1 . Assume the population is normally distributed. Round your answer to three decimal places

The upper boundaries for a distribution of waiting times (in seconds) in a grocery store aisle are47,61,75, and89. List the value for each lower boundary in this distribution.

Find P(Z Attempt 1: 2 attempts remaining. Find P(Z
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Plot the regression relation betweenAgeand ln(AHE) from(b),(c), and (d)for males with a high school diploma. Describe the similarities and differences between the estimated regression functions. Would your answer change if you plotted the regression function for females with college degrees? b) Dependent Variable: LOG(AHE) Method: Least Squares

Hi I need help fairly quick. Could someone please help with these questions? T-tests are used when you want to examine differences but you do not know everything about the population.There are three types of t-tests that you may choose to do:one-sample t-test, independent sample t-test, or dependent sample t-test.You can calculate these by hand,

b. Find the probability 3 people use the ATM between 10:00 and 10:05 given 4 people used it between 10:00 and 10:10
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Suppose that x and y are related by the given equation and use implicit differentiation to determine StartFraction dy Over dx EndFraction . x Superscript 4 Baseline times y Superscript 4equals4 Question content area bottom Part 1 StartFraction dy Over dx EndFraction equals enter your response here

Let f(x) = sin^-1 (1-x^2/1+x^2) . Graph the function f by first finding the following: (a) the domain of f, (b) x and y intercepts (if any), (c) asymptotes (d) end behavior (limits at infinity) (e) intervals where the function is increasing or decreasing, (f) local extrema, (g) intervals where the function is concave up or concave down, (h)

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