Refer to Example 6 where, one day, the visits of n = 48 students to the social

Question:

Refer to Example 6 where, one day, the visits of n = 48 students to the social network site produced the summary statistics
= 35.96 minutes and s = 29.11 minutes n = 48
(a) Calculate a 90% confidence interval for the mean daily time spent on the social network site.
(b) Compare your interval with the two confidence intervals obtained in Example 6. Comment.