Some movie studios believe that by adding sexually explicit scenes to the home video version of a movie, they can increase the movie’s appeal and profitability. A studio executive decided to test this belief. She organized a study that involved 40 movies that were rated PG-13. Versions of each movie were created by adding scenes that changed the rating to R. The two versions of the movies were then made available to rental shops. For each of the 40 pairs of movies, the total number of rentals in one major city during a 1-week period was recorded.

a. Do these data provide enough evidence to support the belief?

b. As an analyst for a movie studio write a report detailing the statistical analysis.