Like books and stories, television not only entertains, it also exposes a child to new information about the world. While watching too much television 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 television they watched per week. Examine the linearity assumption in the regression model GPA = β₀ + β₁Hours + ɛ.