Assume that you want to construct a 95% confidence interval estimate of a population mean. Find an estimate of the sample size needed to obtain the specified margin of error for the 95% confidence interval. The sample standard deviation is given below.
Margin of errors=$6,
The required sample size is __
We have given here,
Standard deviation =$22
Margin of error =E=$6
Level of significance = 1-0.95=0.05
Z critical value is (by using Z table)=1.96
Sample size formula is
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