5. In a random sample of five airlines, the round trip fare from Ontario to San Francisco is foundto be $266, $288, $297, $316, and $384. Assume that airfares are normally distributed with astandard deviation of $45 dollars.a. find the sample mean.b. construct a 90% confidence interval for the population mean.c. construct a 95% confidence interval for the population mean.N(0,1)

It is given that Sample size n = 5 Population SD = 45 The critical values of Z at 90% and 95%…

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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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C?
(Q1). The principal randomly selected six students to take an aptitude test in her school. Their scores were: 87 86 89 78 75 70 Assume that the population is normally distributed. a. What is the point estimate of the mean aptitude test score for this school? b. What is the margin of error when estimating the mean aptitude test score if using 95% confidence. c. Construct a 95% confidence interval estimate of the mean aptitude test score for this school.
Constructing a Confidence Interval for a Population Proportion In a survey funded by a large university, 750 of 1000 adult Seattle residents said they did not believe they could contract a sexually transmitted infection (STI). Construct a 95% confidence interval for the proportion of all adult Seattle residents who don't believe they can contract an STI. Select the correct interval below. (.728, .772) (.723, .777) (.718, .782) (.713, .878) (.665, .835)
You sample 36 students to find out how many hours they spent online last week. Your sample mean is 54. The population standard deviation, sigma, is 8.2. Your client now wants the 90% confidence interval for this sample mean. It is: 40.1 to 67.9 51.8 to 56.2 40.5 to 67.5 51.0 to 56.0
A survey asked, "How many tattoos do you currently have on your body?" Of the 1233 males surveyed, 183 responded that they had at least one tattoo. Of the 1042 females surveyed, 139 responded that they had at least one tattoo. Construct a 95% confidence interval to judge whether the proportion of males that have at least one tattoo differs significantly from the proportion of females that have at least one tattoo. Interpret the interval. C Let p₁ represent the proportion of males with tattoos and p2 represent the proportion of females with tattoos. Find the 95% confidence interval for p₁ -P2- The lower bound is The upper bound is (Round to three decimal places as needed.)
Explain also how you use Z table ..
9 The standard error of the mean is, a 0.881 b 0.735 c 0.612 d 0.510
The figure to the right shows the results of a survey in which 2000 college graduates from the year 2016 were asked questions about employment. Construct 99% confidence intervals for the population proportion of college students who gave each response. Employment College students' responses to questions about employment Expect to stay at first employer for 3 or more years Completed an apprenticeship or intemship 70% 66% Employed in field of study 61% Feel underemployed 46% Prefer to work for a large company 15% The 99% confidence interval for the proportion of college students that expect to stay at their first employer for 3 or more years is (Round to three decimal places as needed.)
The figure to the right shows the results of a survey in which 2000 college graduates from the year 2016 were asked questions about employment. Construct 99% confidence intervals for the population proportion of college students who gave each response. Employment College students' responses to questions about employment Expect to stay at first employer for 3 or more years Completed an apprenticeship or internship 70% 66% Employed in field of study 61% Feel underemployed 46% Prefer to work for a large company 15% The 9970 Conuenit initivaliui int proportion un cuiityt diuutid inal txptul iu diay al ineli idi empivyti iui j'ui muit years is (0.01, 0.121). (Round to three decimal places as needed.) The 99% confidence interval for the proportion of college students that have completed an apprenticeship or internship is (J.). (Round to three decimal places as needed.)
10 The interval estimate is, a 12.2 13.4 b 11.8 13.8 c 11.1 14.5 d 10.0 15.6
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- find the sample mean. . construct a 90% confidence interval for the population mean. .construct a 95% confidence interval for the population mean.