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Mathematics Questions and Answers February 26, 2023

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Consider the probability that more than 89 out of 153 DVDs will work correctly. Assume the probability that a given DVD will work correctly is 58%. Approximate the probability using the normal distribution. Round your answer to four decimal places.

A national poll by the Institute for College Access and Success showed that in 69% of college graduates from public and nonprofit colleges in 2013 had student loan debt. Dr. Blackman wanted to find out if her public nonprofit university had a lower proportion of students who graduated with student loan debt in 2013. For this survey, the null

4-13 Johnson Filtration, Inc., provides maintenance service for water filtration systems throughout southern Florida. Customers contact Johnson with requests for maintenance service on their water filtration systems. To estimate the service time and the service cost, Johnson's managers want to predict the repair time necessary for each maintenance

In order to investigate the relationship between mean life time in years among people who do not smoke and those who smoke regularly. Two random samples of each type of person were taken, with the following results: n x-bar s nonsmoker 180 72 7 smoker 200 63 16 Construct a 95% confidence interval for the difference in the population means based on

lund the area Of the bounded region 011-- ('loscd by the graphs of My) = 21/2, My) = 2+y 19 1. Area : -6- sq. units 7 2. Area :: -2- sq. units 9 . 3 Area -.: Z- sq. umts

Name:__________________________ Chapter 4 Problem Solving 1. A long-term study of changing environmental conditions in the Chesapeake Bay found the following annual average salinity readings in one location in the bay, where t = 0 stands for the year 2000, t = 10 stands for the year 2010, etc. 0 1 2 3 4 5 6 7 t (year) 9.3 14.9 13.9 14.8 13.3 15

College Algebra Question: How can factoring and LCMs help make solving rational equations simpler? Can you also provide an example.

***PLEASE ANSWER ALL QUESTIONS, AND PROVIDE ALL EQUATIONS AND METHODS, THANK YOU 10.48 An important feature of digital cameras is battery life, the number of shots that can be taken before the battery needs to be recharged. The file contains battery life information for 29 subcompact cameras and 16 compact cameras. (Data extracted from Digital

The estimate of the population proportion is to be within plus or minus 0.06, with a 95% level of confidence. The best estimate of the population proportion is 0.19. How large a sample is required?(Round up your answer to the next whole number.) Sample size

1) A study was conducted to determine if the percent of women who received financial aid is different form the percentage of men who receive financial aid. A random sample of students revealed the results shown in the table. Using(=0.01), is there significant evidence to reject the null hypothesis? women men sample size 250 300 number receiving

The Final Paper provides you with an opportunity to integrate and reflect on what you have learned during the class. The question to address is: What have you learned about statistics? In developing your responses, consider at a minimum and discuss the application of each of the course elements in analyzing and making decisions about data (counts

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Set 2 Economics 3120 Fall 2015 J. Berry N. Kanazawa Q. Yu Due Tuesday, September 22nd, in class For problems 2 and 5, attach associated Stata .do and .log les. 1. (Wooldridge C.2) Let Y1 ,Y2 , ...,Yn be n i.i.d. random variables with common mean and common variance 2 . Let Y denote the sample average. (a) Dene the class of linear estimators of by

Under what condition might you prefer to use the median rather than the mean as the best measure of central tendency? Explain why

1. The manager at the local auto shop has found that the probability that a car brought into the shop requires an oil change is 0.66, the probability that a car brought into the shop requires brake repair is 0.34, and the probability that a car requires both an oil change and brake repair is 0.22. For a car brought into the shop, determine the

Week 7 Homework Assignment PERT Network Diagram 1 illustrates the ten interrelated activities that comprise a certain project. PERT Network Diagram 1 1 The information presented in Table 1 applies to the project activities at a particular point in time during the project. Table 1 Activi ty Predeces sor Activities A Estimated Completion Time

Question 1 The two properties about a set of measurements of a dependent variable that we are most interested in describing are: Question 1 options: frequency and average. average and correlation. central tendency and dispersion. histograms and polygons. Question 2 The ________________ is the sum of all the scores divided by the number of scores.

Sat scores Assume that in 2008 the mean mathematics sat score was 498, and the standard deviation was 112. A sample of 63 scores is chosen. What is probability that the sample mean score is less than 481. Round the answer to four decimal places.

Wk4D -Prob & Stats - 2 questions Please help with the two questions below. These are discussion questions so I do not need lengthy answers - just a paragraph or so will suffice. Please no plagiarism or asking me to visit your page or asking for more money or saying you will answer it later. Either answer the question - or don't. 1. Recently, the

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QUESTION 1 For a perfect correlation to happen. What would the last y value need to be? x y 1 2 2 4 3 ? QUESTION 7 If 79 like dogs and cats, 13 like dogs only, and 95 like cats only, what is the probability of selecting a person who likes dogs, regardless if they like cats? Report your answer in percentage form and round to the second decimal

if f(x)= 90/ 1+8e^-t the limit t---> 00(infinity) f(t)= how would you solve this?

suppose that a gas station the daily demand for a regular gasoline is normamly distributed with a mean of 150000 gallons and a standard deviation of 18500 gallons. the station manager has just opened the station for business and finds that there are exactly 120000 gallons of regular gasoline in storage. the next delievery is scheduled later today

Television viewers often express doubts about the validity of certain commercials. In an attempt to answer their critics, a large advertiser wants to estimate the true proportion of consumers who believe what is shown in commercials. Preliminary studies indicate that about 40% of those surveyed believe what is shown in commercials. What is the

1.ThenumberofstrokesXtakenbyprofessionalgolfersonaparticularholefollowsaprobabilitydistributionasshownbelow,wherekissomeconstant: P(X=x) .x|3|4|5|6|7| p(X=x)|0.12 | 4k |3k | 2k | 0.07 | Whatproportionofgolferstakeatleastfivestrokesonthishole? (A)0.48(B)0.25(C)0.57(D)0.43(E)0.52 2.Most experts agree that depression is best treated using a

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For the standard normal distribution, the area between z = 0.95 and z = 1.72, rounded to four decimal places, is:

Indicate whether each of the following define partitions on the set of integers. Explain your answer. The sets of odd and even integers The sets of positive and negative integers The set of integers greater than 100 and the set of integers less than 200 The set of all integers

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Project Eli Orchid has designed a new pharmaceutical product, Orchid Relief, which improves the night sleep. Before initiating mass production of the product, Eli Orchid has been market-testing Orchid Relief in Orange County over the past 9 weeks. Now that the daily demand for Orange County can be predicted with reasonable accuracy using the M3

The Chamber of Commerce periodically sponsors public service seminars and programs. Currently, promotional plans are under way for this year's program. Advertising alternatives include television, radio, and newspaper. Audience estimates, costs, and maximum media usage limitations are as shown: Constraint Television Radio Newspaper Audience per

Research and Policy Development Paper Prepare a 1,400- to 1,750-word paper describing the importance of research as it relates to policy development within the field of criminal justice. Address each of the following in your paper: Identify the purposes and types of policies within the field of criminal justice. Describe the relationship between

1 points QUESTION 4 A spelling test was given to all first-year statistics students in a large university. The scores from two random samples are shown in the following table. Males Females mean 75.1 78.1 variance 103.9 90.6 sample size 40 50 Which one of the following statements describes correctly the results of a hypothesis test of the claim

The Cytertonics Communications Company reduced its management staff from 15 managers to 10. The company claimed that five mangers were randomly selected for job termination. However, the five managers chosen are the five oldest among the 15 that were employed. Find the probability that when five managers are randomly selected from a group of 15,

An auditor for American Health Insurance reports that 20% of policyholders submit a claim during the year. 15 policyholders are selected randomly. What is the probability that at least 3 of them submitted a claim the previous year?

he standard error of the estimate (S e ) is essentially the ____. A)mean of the residuals B)standard deviation of the residuals C)mean of the independent variable D)standard deviation of the independent variable 6. A multiple regression analysis including 50 data points and 5 independent variables results in e i 2 = 40. The multiple standard error

Ch 6 Homework Find the following z values for the standard normal variable Z. Use Table 1. (Negative values should be indicated by a minus sign. Round your answers to 2 decimal places.) a. P(Z z) = 0.1020 b. P(z Z 0) = 0.1772 c. P(Z > z ) = 0.9929 d. P(0.40 Z z) = 0.3368

MAT540 Homework Week 3 Page 1 of 3 MAT540 Week 3 Homework Chapter 14 1. The Hoylake Rescue Squad receives an emergency call every 1, 2, 3, 4, 5, or 6 hours, according to the following probability distribution. The squad is on duty 24 hours per day, 7 days per week: Time Between Emergency Calls (hr.) Probability 1 0.15 2 0.10 3 0.20 4 0.25 5 0.20 6

please answer on excel. After plotting demand for four periods, an emergency room manager has concluded that a trend-adjusted exponential smoothing model is appropriate to predict future demand. The initial estimate of trend is based on the net change of 30 for the three periods from 1 to 4, for an average of +10 units. Period Actual Period Actual

a man with too much time on his hands weighed each chocolate candy in a bag of 462 candies one of the chocolates weighed .776gm and it was heavier than 22 of the other chocolates. what is the percentile of this chocolate

Find the rectangular coordinates of the point with the polar coordinates (3, 5 pi over 3)

Having hard time with these 2 questions. Wondering if you can answer so that I can match your answer to mine to see if I did the questions correct. Link to article :http://old.seattletimes.com/text/2018321244.html Q1.)Using this information, what is a 95% confidence interval for the proportion of the population (from which this sample of 1687

I need help with hypothesis testing, significance, effect size, and power. I have about 15 questions and I am not understanding any of this. Thank you,

6./1 points Use properties of limits and algebraic methods to find the limit, if it exists. (If the limit is infinite, enter '' or '-', as appropriate. If the limit does not otherwise exist, enter DNE.) lim x 6 4x 2 24x /x-6

Hello, I am having a moment when it comes to answering this problem. Use the Limit theorem to find the mean and standard error. The amounts of time employees of a telecommunications company have worked for the company are normally distributed with a mean of 5.9 years and a standard deviation of 2.2 years. Random samples of size 15 are drawn from

integral of e^(s*x)*r*e^(-rx)dx please show all steps

Week 1 Hetero Homo Week 2 8 13 6 3 7 15 12 10 5 25 25 7 3 13 28 11 15 19 26 3 16 11 8 30 10 12 7 8 24 15 7 26 26 30 23 10 12 6 5 28 23 9 26 3 12 3 10 8 15 16 7 10 23 6 29 29 25 29 29 27 9 16 19 11 6 9 21 30 24 14 15 29 17 3 7 12 9 Anova: Two-Factor With Replication 21 11 19 7 11 22 20 20 22 14 20 5 13 6 15 8 5 11 13 18 8 10 3 3 13 15 20 10 13 22

10. If we change a 90% confidence interval estimate to a 95% confidence interval estimate,the width of the confidence interval will _____.

Use the given data and the corresponding display to express the confidence interval in the format of x - E < u < x +E. Also interpret the confidence interval. IQ scores of statisticsstudents: 95% confidence; n=25, x =116.0, s=10.3. Minitab N Mean StDev SE Mean 9 5 % CI 2 5 1 1 6 . 0 1 0 . 3 2 . 0 6 ( 1 1 1 . 7 4 8 , 1 2 0 . 2 5 2 ) What is the

research shows that 14% of the 6th graders in k-6 schools have tried cigarettes and 61% of the 7th graders in 8-9 or 7-9 middle schools have tried cigarettes. what is the absolute increase, to the nearest percent? a. 77% b. 336% c. 436% d. 47%

1 llowsky Page 505 Ex 77 An article in the San Jose Mercury News stated that students in the California state university system take 4.5 years, on average, to finish their undergraduate degrees. Suppose you believe that the mean time is longer. You conduct a survey of 49 students and obtain a sample mean of 5.1 with a sample standard deviation of

1: Simulating From The Sampling Distribution and Hypothesis Testing A disease simulator can be found at the following link: https://www.learner.org/courses/envsci/interactives/disease/disease.html The simulator models the spread of a disease across a population over the course of 100 days. We will be using this application to simulate an outbreak

A point is chosen at random (according to a uniform PDF) within a semicircle of the form { (x, y) I x 2 + y 2 r 2 , y O}, for some given r > O. (a) Find the joint PDF of the coordinates X and Y of the chosen point. (b) Find the marginal PDF of Y and use it to find E[Y] . (c) Check your answer in (b) by computing E[Y] directly without using the

BME 3721 Fall 2016 HW#3 Due 9/28/2016 Software can be used to calculate the answers, but show all equations used on all problems. 1. A researcher wishes to know if the amount of co-contraction between the ankle flexors and extensors as measured by Co-contraction index (CCI) predicts fall risk as measured by Four-square-step-test (FSST). CCI FSST

LetAAandBBbe two events whereP(A)=0.52P(A)=0.52,P(B)=0.2P(B)=0.2, andP(Bc|Ac)=0.91P(Bc|Ac)=0.91. What is the probability ofAAorBB?

1. An experimenter wants to conduct a hypothesis test on a claim that there was no difference between two population means. That is, H0: 1 2 = 0. The experimenter randomly selected 10 items from the first population and 10 items from the second population. The population variances are assumed to be known. Specifically, the variance of the first

4. The following questions refer to a capital budgeting problem with five projects represented by binary variables a, b, c, d, and e. a. Write a constraint modeling a situation in which two of the projects 1, 3, and 5 must be undertaken. b. Write a constraint modeling a situation in which, if project 2 or 5 is undertaken, they must both be

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For the following sample, use the computational formula to calculate SS. then, compute the sample variance and standard deviation. scores 1,3,1,1 show your work. computational formula must be used

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1. The Statistical Abstract of the United States published by the U.S. Census Bureau reports that the average annual consumption of fresh fruit per person is 99.9 pounds. The standard deviation of fresh fruit consumption is about 30 pounds. Suppose a researcher took a random sample of 38 people and had them keep a record of the fresh fruit they

a rock is thrown into a still pog. the circular riiples move outward from the point of impact of the rock so that the radius of the circle formed by a ripple increases at the rate of 2 feet per minute. find the rate at which the area is changing at the instant the radius is 18 feet. when the radius is 18 feet, the area is changing at approximately

Option #1: Counting Principles #1 Write a paper that adheres to the Written Assignment Requirements in the CSU-Global Guide to Writing and APA Requirements. In addition, the items noted in the Good Writing Tips section should be observed. Your paper should contain a title page, an introduction, a body, a conclusion, and possibly a list of

we sample 20 new cars and find the average miles per gallon to be 26 with a standard deviation of 1.7. Q: If we increase our sample size to 40, what is the standard error of the mean? **need equation and calculations**

According to the Census, a certain town has a population of 20000 people age 18 and over. Of them, 10% have incomes over $75000 a year. i) As part of a pre-election survey, a simple random sample of 100 people will be drawn from this population. What is the chance that exactly 10 people in the sample have incomes over $75000 a year? ii) A simple

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Before unveiling the new Tesla Model 3, the company wants to reduce the complexity of manufacturing the new model. At the moment, they are thinking of offering among 6 different colors, and 4 different optional item (sunroof, enhance navigation system, spoiler, and an extended battery pack). (a) How many ways can users select options for the new

The proportion of vehicles which drive above the speed limit on a freeway is 80%. Suppose 20 vehicles are randomly clocked. The probability that 18 vehicles drive above the speed limit is: A 0.1369 B 0.1746 C 0.2054 D 0.2182

Movie companies need to predict the gross receipts of individual movies once a movie has debuted. The data, shown in the next column and stored in PotterMovies , are the first weekend gross, the U.S. gross, and the worldwide gross (in $ millions) of the eight Harry Potter movies: Title First Weekend US Gross Worldwide Gross Sorcerer's Stone 90.295

School Type Private Private Private Public Private Public Private Private Private Private Private Private Private Private Private Public Public Private Private Private Best College ROI by Majo 2013: Payscale.com Cost 30 Year ROI Annual ROI $222,700.00 $1,786,000.00 $176,400.00 $1,758,000.00 $212,200.00 $1,714,000.00 $125,100.00 $1,535,000.00

Please help! Would would I say in conclusion to this information. CASE STUDY 12.1 QNT/275 -paragraph form Case Study 12.1 Akiko Hamaguchi, the manager at a small sushi restaurant in Phoenix, Arizona, is concerned that the weak economic environment has hampered foot traffic in her area, thus causing a dramatic decline in sales. Her cousin in San

QUESTION 5 "A researcher investigates whether or not a new cold medication disrupts mental alertness. It is known that scores on a standardized test containing a variety of problem-solving tasks are normally distributed with a mean of 25 and a standard deviation of 10. A random sample of 25 subjects are given the drug and then tested. For this

For hypotheses that compare two population means, what test statistic is used when the population standard deviations are unknown?

We show the companies with the largest oil refining capacity in the world according to thePetroleum Intelligence Weekly. Use these population data and answer the questions. Company Capacity (barrels per day in 1,000s) ExxonMobil 6,300 Royal Dutch/Shell 3,791 China Petrochemical 2,867 Petroleos de Venezuela 2,437 Saudi Arabian Oil 1,970 BP Amoco

A paper in the May 2002 issue of The Journal of Pediatrics presented the results of research onvarious characteristics in children of diabetic mothers. The studies have shown that maternal diabetes results in obesity and blood pressure complications in the offspring. Following are the arterial blood pressures, in millimeters of mercury (mm Hg),

About Applied Regression in R The data set in the file named destroyers.dat contains the standard Displacement (long tons), Length (ft), Beam (ft), and Draft (ft) of the different classes of destroyers that have served in the U.S. Navy. Natural physical considerations might suggest that Displacement Length Beam Draft Q: Form 95% confidence

The Tennessee tourism institute (ITT) plans to sample information center visitors entrring the state to learn the fraction of visitors who plan to camp in the state. Current estimates are that 35% of visitors are campers. How large a sample would you take to estimate at a 95% confidence level the population proportion with an allowable error of 2%

2. Data from two samples gave the following results: sample 1 sample 2 n Y s 6 40 4.3 12 50 5.7 a) Compute the unpooled SE of b) Compute the pooled SE of 3. In a study of the nutritional requirements of cattle, researchers measured the weight gains of cows during a 78-day period. For two breeds of cows, Hereford(HH) and Brown Swiss/Hereford(SH),

3. (a) Find the minimum of the function f(x, y, z) = (x 2)^2 + (y 1)^2 + z^2 subject to the constraint x^2 +y^2+z^2 = 1, using the method of Lagrange multipliers (b) Give a geometric interpretation of this problem.

Suppose that you are climbing a hill whose shape is given byz=4620.03x^20.06y^2and that you are at the point(60,30,300). In which direction should you proceed initially in order to reach the top of the hill fastest? If you climb in that direction, at what angle above the horizontal will you be climbing initially (radian measure)?

recent nationwide study investigated the value of the prostate-specific antigen (PSA) blood test for the detection of prostate cancer among 100,000 men 50 years of age and older. Of the 686 men who tested positive on the PSA test, a total of 281 were ultimately diagnosed with prostate cancer, either by immediate needle biopsy or during 12 months

You want to complete a set of 100 baseball cards. Cards are sold in packs of ten. Assume that each individual card in the pack has a uniformly random chance of being any element in the full set of 100 baseball cards. (In particular, there is a chance of getting identical cards in the same pack.) How many packs of cards should you buy in order to

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A coinoperated drink machine was designed to discharge a mean of ounces of coffee per cup. In a test of the machine, the discharge amounts in randomly chosen cups of coffee from the machine were recorded. The sample mean and sample standard deviation were ounces and ounces, respectively. If we assume that the discharge amounts are normally

Chamberlain College of Nursing NR503 Population Health, Epidemiology, & Statistical Principles Relative Risk Calculations Worksheet Guidelines & Grading Rubric Purpose The purpose of this assignment is to help you to begin to understand and apply the important counts, ratios, and statistics presented in healthcare and epidemiological research.

At a factory that produces pistons for cars, Machine 1 produced 147 satisfactory pistons and 63 unsatisfactory pistons today. Machine 2 produced 210 satisfactory pistons and 90 unsatisfactory pistons today. Suppose that one piston from Machine 1 and one piston from Machine 2 are chosen at random from today's batch. What is the probability that the

Math 2311 EMCF Homework 12 Sections 8.3 - 8.4 Honework will NOT be accepted through email or in person. Homework must be submitted through CourseWare, https://www.casa.uh.edu, before the deadline. Submit this assignment on CourseWare under \"EMCF\" and choose ehw12. 1. The choice between a z-test and a t-test for a population mean depends

#1 STA355H1F due Wednesay, October 5, 2016 Problems to hand in: 1. Suppose that X1 , , Xn are independent Exponential random variables with density f (x; ) = exp(x) for x 0 where > 0 is an unknown parameter. (a) Show that the quantile of the Exponential distribution is F 1 ( ) = 1 ln(1 ). (b) The form of the quantile function in part (a) can be

Math 160 Midterm Review MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. Provide an appropriate response. 1) The following frequency distribution analyzes the scores on a math test. Find the class boundaries of scores interval 40-59. Scores 40-59 60-75 76-82 83-94 95-99 A) 39.5, 58.5 Number of

1.What SPSS menu tab permits you to begin the process of calculating a new variable? a. Analyze b. Compute c. Create d. Transform 2. Chapter 2 Quiz 2 What does the SPSS Values column help you accomplish? a. give descriptive statistics b. expand on variable names c. place words with variable values d. identify variable names 3. Chapter 2 Quiz 3 The

if a penny is tossed 4 times and comes up heads all 4 time, the probability of heads on the fifth trial is?

The efficiency of the engines of subsonic airplanes depends on air pressure and is usually maximum near 35000 ft. Find the air pressure at this height. Physical information. The rate of change is proportional to the pressure. At 18000ft it is half its value at sea level

One of the earliest applications of the Poisson distribution was in analyzing incoming calls to a telephone switchboard. Analysts generally believe that random phone calls are Poisson distributed. Suppose phone calls to a switchboard arrive at an average rate of 2.4 calls per minute. (a) If an operator wants to take a one-minute break, what is the

Test the hypothesis that the 5-year incidence rate of cataracts is different in the excessive-sunlight-exposure group compared with the general population, and report a p-value (two-sided).

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I have this entire question answered except for #c, the percent. I come out with 47.62% but my checker is telling me that is not correct. Customers experiencing technical difficulty with theirinternetcable hookup may call an 800 number for technical support. It takes the technician between 90 seconds and 12 minutes to resolve the problem. The

Four different paints are advertised as having the same drying time. In order to check the manufacturers' claims, five paint samples were tested for each make of paint. The time in minutes until the paint was dry enough for a second coat to be applied was measured. The following data were obtained. Paint 1 Paint 2 Paint 3 Paint 4 128 144 133 153

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