# Estimating a Population Proportion Margins of Error

For each of the following situations, determine the margin of error:

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a. X = 2.47, and n = 12, confidence coefficient = 0.98, σ = 6.58

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b. X = 13.9, and n = 21, confidence coefficient = 0.95, s = 2.33

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c. X = 114.7, and n = 500, confidence coefficient = 0.80, s = 15.6

If you wish to estimate a population mean and have your estimate be within ±0.25 of the true value and you wish to have a confidence level of 99%, what sample size will be required if the population standard deviation is known to be 1.20?

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#### Solution Summary

The solution determines the margin of error for three different examples.

$2.19