Does aerobic exercise reduce blood serum cholesterol levels?To find out,a medical researcher assigned subjects who were not already exercising regularly to do a randomlyselected number of exercise hours per week.After 6 months of exercising the prescribed number of hours, each subject's cholesterol level was measured, yielding the data in the following table:

Subject No.Hours of Exercise per Week. Serum Cholesterol Level

1 4 220

2 7 180

3 2 210

4 11 170

5 5 190

6 1 230

7 10 200

8 8 210

a. Calculate the appropriate correlation coefficient for the data in the table (2 points).

b. Report the significance of the correlation at the .05 level (two-tailed) (2 points).

c. What conclusion can you draw from your answer to part b (2 points)?