Numerous studies have shown that watching too much television hurts school grades. Others have argued that television is not necessarily a bad thing for children (Mail Online, July 18, 2009). Like books and stories, television not only entertains, it also exposes a child to new information about the world. While watching too much TV is harmful, a little bit may actually help. Researcher Matt Castle gathers information on the grade point average (GPA) of 28 middle-school children and the number of hours of TV they watched per week. The data set, labeled Television, can be found on the text website. Examine the linearity assumption in the regression model, GPA = β0 + β1Hours + y̅.