Answered: he Daily Universe wanted to know the…

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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Question

The Daily Universe wanted to know the percentage of BYU returned missionaries who married within a year of returning from his/her mission. 10 students were randomly surveyed and their responses were recorded. They report their 98% confidence interval to be (0.55, 0.75).

a)Is this a valid confidence interval?

No, because the sample size was too small

No, because it was a survey

Yes, because the sample was random

Yes, because there was a big enough sample size

b)Suppose The Daily Universe wanted to calculate a 95% confidence interval with a margin of error of 0.03. How many BYU returned missionaries need to be randomly sampled?

251

1068

c)The researchers decided that it was too expensive to sample as many as was required for their calculations. To decrease the required sample size and therefore the cost, they could increase their confidence level and decrease the desired margin of error.

True

False

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