A simple random sample with n = 56 provided a sample mean of 29.5 and a sample standard deviation of 4.4. (Round your answers to one decimal place.) (a) Develop a 90% confidence interval for the population mean. t0 (b) Develop a 95% confidence interval for the population mean. to (c) Develop a 99% confidence interval for the population mean. to (d) What happens to the margin of error and the confidence interval as the confidence level is increased? Q As the confidence level increases, there is a smaller margin of error and a more narrow condence interval. Q As the confidence level increases, there is a larger margin of error and a wider confidence interval. 0 As the confidence level increases, there is a larger margin of error and a more narrow confidence interval. Q As the confidence level increases, there is a smaller margin of error and a wider condence interval