Some people drink coffee to relieve stress on the job. Is there a correlation between the number of cups of coffee consumed on the job and perceived job stress? Suppose the data shown represent the number of cups of coffee consumed per week and a stress rating for the job on a scale of 0 to 100 for nine managers in the same industry. Determine the correlation between these two variables, assuming you do not want to use the Pearson product-moment correlation coefficient.

Cups of Coffee per Week Job Stress

25 .........80

41 .........85

16 .........35

0 ...........45

11 .........30

28 .........50

34 .........65

18 .........40

5 ...........20