Part 3: Putting the Pieces TogetherSome of the following questions might be more challenging, butwe want you to wrestle through them and ask for clarificationalong the way. We hope that, ultimately, working through theseproblems will strengthen your understanding of the big ideasbehind confidence intervals.10. A researcher plans to survey a random sample ofundergraduate students in order estimate the proportion ofall undergraduate students who plan to apply to graduateschool, and she will construct a confidence interval basedon the data she gathers. Which one of the followingcombinations of sample size and confidence level willresult in the most precise confidence interval?A.n= 500, confidence level = 95%B. n = 500, confidence level = 90%c.n= 1000, confidence level = 99%D. n 1000, confidence level = 90%E.n=200, confidence level = 99%11. What proportion of adults are afraid of spiders? Toestimate this unknown population proportion, a researchergathers a random sample of data and constructs a 95%confidence interval. The interval ends up being from 0.18to 0.32. From this information, we know the sampleproportion would have to beand the marginof error would have to be12. Gary constructs a 90% confidence interval in order toestimate the proportion of consumers who regularlypurchase their groceries online. The interval ends upbetween from 0.355 to 0.405. Using the same sample data,Ralph constructs a 95% confidence interval and obtains aninterval from 0.365 to 0.395. If we assume no calculationerrors were made when the 90% confidence interval wasconstructed, why must Ralph's interval be incorrect?

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MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

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on the data she gathers. Which one of the following combinations of sample size and confidence level will result in the most precise confidence interval?