Refer to Exercise 13.27. The following table, reproduced from that exercise, 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. Construct a 98% confidence interval for B. You can use the results obtained in Exercises 13.27 and 13.42.
b. Test at the 1% significance level whether B is negative.

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Time (hours per day 4.4 6.2 4.2 16 4.7 54 13 2.1 6.1 3.3 4.4 3.5 GPA .22 2.21 3.13 3.69 2.7 2.2 3.69 3.25 2.66 2.89 2.71 3.36