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Determine the sample size for a on-line survey with a variability of 30% and a 95% confidence interval? What sample size would you need for a 99% confidence interval? a 90% confidence interval?

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

Determine the sample size for a on-line survey with a variability of 30% and a 95% confidence interval? What sample size would you need for a 99% confidence interval? a 90% confidence interval?

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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