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%?

MATLAB: An Introduction with Applications
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ISBN:9781119256830
Author:Amos Gilat
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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%?
Transcribed Image Text: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%?
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