Question

You want to obtain a sample to estimate a population mean. Based on previous evidence, you believe the population standard deviation is approximately σ=59.1σ=59.1. You would like to be 90% confident that your estimate is within 5 of the true population mean. How large of a sample size is required?

As in the reading, in your calculations:
--Use z = 1.645 for a 90% confidence interval
--Use z = 2 for a 95% confidence interval
--Use z = 2.576 for a 99% confidence interval.

Answer 1

TOPIC:Finding the required sample size for the given confidence level and the allowable margin of error.