Studying for class. Refer to the previous exercise. Overall, 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.
(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.
(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.