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If you want to be 95% confident of estimating the population mean to within a sampling error of 20 and the standard deviation1.1 0,8643 0.8665 0.8686 0.8708 0.8729 0,8749 0,8770 0.8790 0.8810 0.8830 12 0,8849 0.8869 0.8888 0.8907 0.8925 0.8944 0.8962U.9830 0.9842 U.9846 V.9830 U.9834 U.983 U.9821 U.9826 U.9834 U.9838 0.9887 0.9913 2.2 0.9861 0.9864 0.9868 0,9871 0.9875 0.9

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Answer #1

Critical value at 95% confidence (Z)=1.96 (using z table)

Margin of error(ME) z* sampling error 1.96 20 39.2 1.9680216 sample size(n) ME 39.2 hence n 16

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