how large a sample should be selected to provide a 99% confidence interval with a margin...

Question

Question

how large a sample should be selected to provide a 99% confidence interval with a margin of error of 5 when the population standard deviation is 25?

math Statistics-And-Probability

Answer 1

Answer #1

Solution :

Given that,

Population standard deviation = = 25

Margin of error = E = 5

Z_/2 = 2.576

sample size = n = [Z_/2* / E] ²

n = [2.576 * 25 / 5]²

n = 166

Sample size = n = 166

Answer 2

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