Answer Happy

Urimited 1 6 7 V8 90 A population has standard deviation - 17.2 Part 1 of 2 (a) How large a sample must be drawn so that a 99.5% confidence interval for u will have a margin of error equal to 427 Round the critical value to no less than three decimal places Round the sample size up to the nearest Integer A sample size of needed to be drawn in order to obtain a 99.5% confidence interval with a maron of error equal to 42 Part 2 of 2 (b) If the required confidence level were 99.9% would the necessary sample size be larger or smaller? (Choose one) because the confidence level is (Choose one)