Question

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:

15	21	16	20	19	14
19	19	19	13	16	17
20	19	13	13	17	13
13	13	13	19	14	19

1. What is the mean for this sample of 24 students? Round to one decimal place.

2. Describe the distribution of the sample means for all samples of size 24. Describe any concerns about applying the Central Limit theorem that someone might have.

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

Answer 1

We are 95% confident that the true average of number of credit hours of students beyond the confidence limits.