1. Among n=15 randomly selected participants of a hypothetical study, cholesterol was measured at Exam 1 and Exam 2.Tthe mean difference in cholesterol between the two exams was -15.5 units and the standard deviation was 22.8 units. Differences were computed by subtracting the Exam 1 from Exam 2 value. Is there a statistically significant difference in mean cholesterol measured at Exam 1 and Exam 2 of the study?

1. What kind of an outcome is this? What kind of a sample is this?
2. Set up the null and research hypotheses
3. Select the test statistic
4. Set up the decision rule
5. Compute the test statistic using Excel
6. What is your conclusion?