The following table contains information on the amount of time that each of 12 students spends each day (on average) on social networks (Facebook, Twitter, etc.) and the Internet for social or entertainment purposes and his or her grade point average (GPA).

a. Construct a scatter diagram for these data. Does the scatter diagram exhibit a linear relationship between grade point average and time spent on social networks and the Internet?
b. Find the predictive regression line of GPA on time.
c. Give a brief interpretation of the values of a and b calculated in part b.
d. Plot the predictive regression line on the scatter diagram of part a, and show the errors by drawing vertical lines between scatter points and the predictive regression line.
e. Calculate the predicted GPA for a college student who spends 3.8 hours per day on social networks and the Internet for social or entertainment purposes.
f. Calculate the predicted GPA for a college student who spends 16 hours per day on social networks and the Internet for social or entertainment purposes. Comment on this finding.

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Time (hours per day 44 6.2 4.2 1.6 4.7 5.4 3 2.1 6.1 3.3 4.4 3.5 GPA 3.22 2.21 3.13 3.69 2.7 2.2 3.69 3.25 2.66 2.89 2.71 3.36