b) It will be widerc) It will not changeConstruct the requested confidence interval.-13. An article estimates, with 90% confidence, that the proportion of elementary school teachers who arefemale is 82%. The article also states the maximum error of their estimate is 3%.Determine the resulting 90% confidence interval for the proportion of elementary school teacherswho are female.a) (82%, 85%)b)(79%, 82%)c) (80.5%, 83.5%)d)(87%, 93%)e) (79%, 85%)Construct the requested confidence interval.In a random sample of 60 computers, the mean repair cost was $150 with a standard deviation of $36.Construct a 90% confidence interval for the population mean.14.

Answered: Image /qna-images/answer/03ab1346-add1-4644-9def-7922f6500355.jpg

Answered: b) It will be wider c) It will not…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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Which of the following would be a correct interpretation of an 87% confidence interval for the true proportion of students who do aerobics? A) We are 87% confident that the true proportion of students who do aerobics is between 28.8% and 39.9%. B) We are 87% confident that the true average of students who do aerobics is between 28.8% and 39.9%. C) We are 95% confident that the true proportion of students who do aerobics is between 28.8% and 39.9%. D) We are 87% confident that the true proportion of students who do aerobics is between 27.3% and 41.7%.
32. Touch Your Nose With Your Tongue Find the sample size needed to estimate the percentage of adults who can touch their nose with their tongue. Use a margin of error of 2 percentage points and use a confidence level of 90%. a. Assume that p and à are unknown. b. Assume that a previous study showed that 10% of adults can touch their nose with their tongue (based on data from Onedio). c. Does the use of the results from the previous study have much of an effect on the sample size?
39. Create a 95% confidence interval for the data set below. 49 62 54 64 55 49 48 52 65 53 62 ( , ) [three decimal accuracy] [three decimal accuracy]
Which of the following statement(s) about confidence intervals are correct? 1) There is no relationship between sample size and confidence interval's width 2) the smaller the sample size, the wider the confidence interval. 3) The higher the confidence level, The narrower the confidence interval. 4) The higher the confidence level, The wider the confidence interval. 5) The larger the sample size, The wider the confidence interval. 6) There is no relationship between confidence level and confidence interval's width.
A consumer group reports that a 90% confidence interval for the mean fat content of chicken nuggets from a fast-food restaurant is (14, 18). What is the mean fat content for the sample of 30 chicken nuggets or the point estimate that help make this confidence interval? A. 32 B. 16 C. 2
A research center survey of 2,484 adults found that 1,942 had bought something online. Of these online shoppers, 1,295 are weekly online shoppers. Complete parts (a) through (c) below. a. Construct a 95% confidence interval estimate of the population proportion of adults who had bought something online. Sas (Round to four decimal places as needed.) led b. Construct a 95% confidence interval estimate of the population proportion of online shoppers who are weekly online shoppers. Sas (Round to four decimal places as needed.) c. How would the director of e-commerce sales for a company use the results of (a) and (b)? O A. Since a greater proportion of adults have purchased something online than are weekly online shoppers, the director of e-commerce sales may want to focus on those adults who have purchased something online. led O B. The information cannot be compared because it is derived from two different opinions. O C. Agreater proportion of adults have purchased something online, but…
10. Which one of the following statements about confidence intervals is false? A. Given the same sample of data, a 90% confidence interval will be narrower than a 95% confidence interval. B. The size of the population does not affect the width of a confidence interval. C. The population proportion determines the center of the confidence interval. D. The value of z* affects the width of a confidence interval. E. The general format of a confidence interval is “sample statistic ± margin of error.”
2. In a simple random sample of 1200 Americans age 20 and over, 138 of them were found to have Type I diabetes. Round all answers to three decimal places. a) Report a 95% confidence interval for the proportion of all Americans age 20 and over with diabetes. J b) According to the Centers for Disease Control and Prevention, nationally, 10.7% of all Americans age 20 and over have diabetes. Does the confidence interval you found support or refute this claim? Explain.
1. What conclusions can you draw about the proportions of Satisfaction with Quality of Care from Nurses and Satisfaction with Quality of Care from Specialists from the chart? A. The confidence intervals overlap, so we can conclude that the proportions are significantly different. B. The confidence intervals do not overlap, so we can conclude that the proportions are significantly different. C. The confidence intervals do not overlap, so we cannot conclude that the proportions are significantly different. D. The confidence intervals overlap, so we cannot conclude that the proportions are significantly different. 2. What conclusions can you draw about the proportions of the Satisfaction with Quality of Care from Nurses and Satisfaction with Quality of Care from Practitioners from the chart? A. The confidence intervals do not overlap, so we cannot conclude that the proportions are significantly different. B. The confidence…
1- A researcher wants to learn the ratio of smoking habit among the university students. Out of 1000 male students 300 of them said "yes I am smoking" and out of 800 female students 200 of them said "yes I am smoking". Construct % 99 confidence interval for the smoking habit for female students. (use three decimal) a) None of them correct 3831o b) 0.250, 0.304 0.236 , 0.318 0.092, 0.130 0.211, 0.289
8. A confidence interval for estimating the mean An industrial/organizational psychologist wants to improve worker productivity for a client firm, but first he needs to gain a better understanding of the life of the typical white-collar professional. Fortunately, he has access to the 2008 Workplace Productivity Survey, commissioned by LexisNexis and prepared by WorldOne Research, which surveyed a sample of 650 white-collar professionals (250 legal professionals and 400 other professionals). One of the survey questions was, “How many work-related emails do you receive during a typical workday?” For the subsample of legal professionals (n = 250), the mean response was M = 36.7 emails, with a sample standard deviation of s = 23.8 emails. The estimated standard error is sMM? = A-0.085, B-1.341, C-0.095 or D-1.505 (choices to choose from.) . Use the following Distributions tool to develop a 90% confidence interval estimate of the mean number of work-related emails legal…
13. We have used a confidence level of 95% to estimate the average hours of television viewing for residents in a retirement home. What is the chance that our interval estimate does not contain the true population mean? (4%) A. 95% B. 5% C. 2.5% D. None of the above 14. There are about 4 million eligible voters in a society. A public opinion pollster has estimated their probable choices for the next president with a sample of 4,000 randomly selected citizens. In this example, the 4,000 citizens are a _____ and the 4 million eligible voters are a _____. (4%) A. Population, sample B. Statistics, parameters C. Parameters, statistics D. sample, population 15. In developing an interval estimate for a population mean, the population standard deviation was known. A 95% confidence interval was used. The interval estimate was [30 - 3:92; 30 + 3:92]. What would be the interval estimate if sample size (n) is quadrupled?…

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