3. What sample size should be chosen to find the mean number if absences per month for schoolchildren to within 0.20 at a 90% confidence level if it is known that the variance is 1.21? What happensto the minimum sample size if we increase the confidence level to 95% ? And to 99%?

GivenMargin of error(E)=0.20confidence level=90%Variance(σ2)=1.21standard deviation(σ)=1.21=1.1

Answered: 3. What sample size should be chosen to…

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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3. What sample size should be chosen to find the mean number if absences per month for school children to within 0.20 at a 90% confidence level if it is known that the variance is 1.21? What happens to the minimum sample size if we increase the confidence level to 95%? And to 99%?