Discuss the following:
The standard deviation of test scores on a certain achievement test is 11.4 . A random sample of 80 scores on this test had a mean of 73.1. Based on this sample, find a 95% confidence interval for the true mean of all scores.
Carry your intermediate computations to at least three decimal places. Round your answers to one decimal place.
1. What is the lower limit of the 95% confidence interval?
2. What is the upper limit of the 95% confidence interval?