You want to obtain a sample to estimate a population mean age. Based on previous evidence, you believe the population standard deviation is approximately o = 5.1 years. You would like to be 90 % confident that your estimate is within 2.5 years of the true population mean. How large of a sample size is required? Give the minimum size that will work. n =

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A: Mean(µ) = 345Standard deviations (σ) = 30X ~ N (µ, σ )= N(345, 30)

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A: Margin of error, M.E = $500 Confidence level (α) = 95% σ =$1500

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A: Given: Population mean, μX=56 Observed Value, x = 68 Standardized Normal Value, z = 2.00

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