Xr04-66 Are the marks one receives in a course related to the amount of time spent studying the subject? To analyze this mysterious possibility, a student took a random sample of 10 students who had enrolled in an accounting class last semester.

He asked each to report his or her mark in the course and the total number of hours spent studying accounting. These data are listed here.

Marks 77 63 79 86 51 78 83 90 65 47 Time spent studying 40 42 37 47 25 44 41 48 35 28

a. Calculate the covariance.

b. Calculate the coefficient of correlation.

c. Calculate the coefficient of determination.

d. Determine the least squares line.

e. What do the statistics calculated above tell you about the relationship between marks and study time?