SOLUTION: Find the dample size required to estimate the maen age of required drivers in the United States. Assume that we want 95% confidence that the sample mean is within 1/2 yera of the t

Question 240040: Find the dample size required to estimate the maen age of required drivers in the United States. Assume that we want 95% confidence that the sample mean is within 1/2 yera of the true mean asge of the population. Also assume that the standard deviation of the population is known to be 12 years.
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
Find the sample size required to estimate the mean age of required drivers in the United States. Assume that we want 95% confidence that the sample mean is within 1/2 year of the true mean age of the population. Also assume that the standard deviation of the population is known to be 12 years.
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n = [z*s/E]^2
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n = [1.96*12/(1/2)]^2 = 2212.76
Rounding up n = 2213
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Cheers,
Stan H.
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