For each of the following situations, determine the margin of error:
a. X = 2.47, and n = 12, confidence coefficient = 0.98, σ = 6.58
b. X = 13.9, and n = 21, confidence coefficient = 0.95, s = 2.33
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?
The solution determines the margin of error for three different examples.