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

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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) About Me  (Show Source):
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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.