Question: Determine the sample size required for a 95% confidence interval for the mean when (a) ???? = 20 and the desired margin of error is

Determine the sample size required for a 95% confidence interval for the mean when

(a) ????̇ = 20 and the desired margin of error is ???????? = 2.5.

(b) ????̇ = 50 and the desired margin of error is ???????? = 8.

(c) ????̇ = 2 and the desired margin of error is ???????? = 0.1.

(d) ????̇ = 200 and the desired margin of error is ???????? = 10.

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