6. A professor at a large university believes that students take an average of 15 credit hours per term. A random sample of 24 students in her class of 250 students reported the following number of credit hours that they were taking: 12 13 14 15 15 15 16 16 16 16 16 16 17 17 17 17 17 17 18 18 18 19 19 20 FYI: for this list, = 16.417 and s = 1.863

A. Does this sample indicate that students are taking more credit hours than the professor believes? Test an appropriate hypothesis and state your conclusion.

B. Find a 95% confidence interval for the number of credit hours taken by the students in the professor's class. Interpret your interval.