Suppose the population standard deviation for IQ scores is 15 points. What sample size would be required to ensure that the width of your 95% confidence interval for the mean IQ score would have a width of no more than 4 points?

Suppose the population standard deviation for IQ scores is 15 points. What sample size would be required to ensure that the width of your 95% confidence interval for the mean IQ score would have a width of no more than 4 points?

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

6. Suppose the population standard deviation for IQ scores is 15 points. What sample size would be required to ensure that the width of your 95% confidence interval for the mean IQ score would have a width of no more than 4 points?

Definition Definition Number of subjects or observations included in a study. A large sample size typically provides more reliable results and better representation of the population. As sample size and width of confidence interval are inversely related, if the sample size is increased, the width of the confidence interval decreases.

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