A simple random sample of size n is drawn from a population that is normally distributed. The sample mean is found to be 114 and the sample standard deviation is found to be 10.
A. Construct a 90% confidence interval about μ if the sample size n is 15
B. Construct a 90% confidence interval about μ if the sample size n is 21
C. Construct a 99% confidence interval about μ if the sample size n is 15