A population is estimated to have a standard deviation of 8. We want to estimate the population mean within 1, with a 95% level of confidence. (Use z Distribution Table.) How large a sample is required? (Round the z-values to 2 decimal places. Round up your answer to the next whole number.) Sample required is

A population is estimated to have a standard deviation of 8. We want to estimate the population mean within 1, with a 95% level of confidence. (Use z Distribution Table.) How large a sample is required? (Round the z-values to 2 decimal places. Round up your answer to the next whole number.) Sample required is