The following table, reproduced from Exercise 13.27, contains information on the amount of time spent each day (on average) on social networks and the Internet for social or entertainment purposes and the grade point average for a random sample of 12 college students.

a. Calculate the standard deviation of errors.
b. Compute the coefficient of determination, and give a brief interpretation of it. What percentage of the variation in GPA is explained by the least squares regression line of GPA on time? What percentage is not explained?

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Time (hours per day 4.4 6.2 4.2 16 4.7 5.4 13 2. 6. 3.3 4.4 3.5 GPA 3.22 2.21 3.13 3.69 2.7 2.23.69 3.25 2.66 2.89 2.71 3.36