A population has standard deviation o = 17.6. Part 1 of 2 (a) How large a sample must be drawn so that a 99.8% confidence interval for u will have a margin of error equal to 4.9? 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 99.8% confidence interval with a margin of error equal to 4.9. Part 2 of 2 (b) If the required confidence level were 90%, would the necessary sample size be larger or smaller? (Choose one) A , because the confidence level is (Choose one) Submit AssignnA sample of size n = 53 has sample mean x - 53.5 and sample standard deviation s = 9.3. Part: 0 / 2 Part 1 of 2 Construct a 95% confidence interval for the population mean u. Round the answers to one decimal place. A 95% confidence interval for the population mean u is