In Problem 13.8, you used the number of Internet users to predict the number of Facebook users by country (stored in Internet ).

a. Construct a 95% confidence interval estimate of the mean number of Facebook users for all countries that have 6.4 million Internet users.

b. Construct a 95% prediction interval of Facebook users of an individual country that has 6.4 million Internet users.

c. Explain the difference in the results in (a) and (b).

Problem 13.8

The file Internet contains data about Internet users and Facebook users as of December 31, 2017, based on a sample of 40 Asian and African countries. Suppose you want to develop a simple linear regression model to predict the number of Facebook users based on the number of Internet users of a country (both measured in million persons).