Determine the minimum sample size required when you want to be 90% confident that the sample...

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Determine the minimum sample size required when you want to be 90% confident that the sample...

Determine the minimum sample size required when you want to be 90% confident that the sample mean is within one unit of the population mean and

sigma=19.8. Assume the population is normally distributed.

A 90 % confidence level requires a sample size of?

math Statistics-And-Probability

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Answer 1

Answer #1

Solution:

Population standard deviation = 19.8

Margin of error = 1

Alpha =0.1

Alpha/2 =0.05, Zalpha/2 = 1.96

Margin of error = Zalpha/2*SD/sqrt(n)

1 = 1.96*19.8/sqrt(n)

n =(1.96*19.8)^2 = 1506

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Answer 2

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