Question: Determine the sample size required for a 99% confidence interval for the mean when (a) ???? = 30 and the desired margin of error is

Determine the sample size required for a 99% confidence interval for the mean when

(a) ????̇ = 30 and the desired margin of error is ???????? = 4.

(b) ????̇ = 5 and the desired margin of error is ???????? = 0.5.

(c) ????̇ = 25 and the desired margin of error is ???????? = 3.5.

(d) ????̇ = 80 and the desired margin of error is ???????? = 7.5.

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