You want to obtain a sample to estimate a population mean. Based on previous evidence, you believe the population standard deviation is approximately σ=44.7. You would like to be 90% confident that...

You want to obtain a sample to estimate a population mean. Based on previous evidence, you believe the population standard deviation is approximately σ=44.7. You would like to be 90% confident that your estimate is within 0.2 of the true population mean. How large of a sample size is required?



n =