Chapter 8: Problem 14
A simple random sample with \(n=54\) provided a sample mean of 22.5 and a sample standard deviation of 4.4 a. Develop a \(90 \%\) confidence interval for the population mean. b. Develop a \(95 \%\) confidence interval for the population mean. c. Develop a \(99 \%\) confidence interval for the population mean. d. What happens to the margin of error and the confidence interval as the confidence level is increased?