A population has standard deviation σ= 17.5. (a) How large a

Last updated: 8/4/2022

A population has standard deviation σ= 17.5. (a) How large a sample must be drawn so that a 90% confidence interval for u will have a margin of error equal to 4.4? Round the critical value to no less than three decimal places. Round the sample size up to the nearest integer. A sample size of is needed to be drawn in order to obtain a 90% confidence interval with a margin of error equal to 4.4 (b) If the required confidence level were 98%, would the necessary sample size be larger or smaller?