7.64 Facebook use in college. Because of Facebookâs rapid rise in popularity among college students, there is a great deal of interest in the relationship between Facebook use and academic performance. One study collected information on undergraduate students to look at the relationships among frequency of Facebook use, participation in Facebook activities, time spent preparing for class, and overall GPA.32
Students reported preparing for class an average of 706 minutes per week with a standard deviation of 526 minutes. Students also reported spending an average of 106 minutes per day on Facebook with a standard deviation of 93 minutes; 8% of the students reported spending no time on Facebook.
(a) Construct a 95% confidence interval for the average number of minutes per week a student prepares for class.
(b) Construct a 95% confidence interval for the average number of minutes per week a student spends on Facebook. ( Hint: Be sure to convert from minutes per day to minutes per week.)
(c) Explain why you might expect the population distributions of these two variables to be highly skewed to the right. Do you think this fact makes your confidence intervals invalid? Explain your answer.