Question 4 of 7 (1 point) |Attempt 6 of Unlimited View question in a popup 40 A population has standard deviation 6 = 17.7. Part 1 of 2 Ed (a) How large a sample must be drawn so that a 95% confidence interval for u will have a margin of error equal to 3.9? 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 95% confidence interval with a margin of error equal to 3.9. Part 2 of 2 (b) If the required confidence level were 80%, would the necessary sample size be larger or smaller? (Choose one) , because the confidence level Is (Choose one)