Problem 4How much time do Americans spend eating or drinking? Suppose for a random sample of1001 Americans, the mean time eating or drinking per day is 1.22 hours with a sample standarddeviation of 0.65 hours.(a) Construct and interpret a 99% confidence interval for the mean amount of time Ameri-cans spend eating or drinking per day.(b) Suppose you want to conduct your own survey. Using the sample standard deviationabove, how large of a sample is required to estimate the mean time Americans spendeating or drinking per day within 15 minutes of the true mean and with 95% confidence?

Given,the mean time, standard deviation of eating or drinking per day.Sample mean, .Sample standard…

Answered: How much time do Americans spend eating…

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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Calculate the sample size to study the average age of a Central State College student, plus or minus 0.4 years. We’d like to be 85% confident about our result. From a previous study, we know that the standard deviation for the population is 2.8.
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A newspaper article reports that the mean cost for preventative dental care per year is $175 with a standard deviation of $35 (assume that this is the population standard deviation). You want to test whether the mean cost for preventative dental care in your company is different from what was reported in the article. You take a random sample of 250 employees and find the mean cost is $171. Does this signficantly differ from what was reported in the article? Run the appropriate test at α=0.05. Give each of the following to receive full credit: 1) the appropriate null and alternative hypotheses; 2) the appropriate test; 3) the decision rule; 4) the calculation of the test statistic; and 5) your conclusion including a comparison to alpha or the critical value. You MUST show your work to receive full credit. Partial credit is available.
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