A professor wants to estimate how many hours per week her students study. A simple random sample of 78 students had a mean of 15.0 hours of studying per week. Assume that the POPULATION standard deviation is known to be 2.3 hours per week. a. Construct a 90% confidence interval for the mean number of hours a student studies per week. . Round to one decimal place. b. Interpret the confidence interval you found in part (a) in the SHOW YOUR WORK area. c. If Prof. St. John's on-line statistics course students study an average of 20 hours per week, are they considered outliers? (Answer in the SHOW YOUR WORK area) Explain