Question

4. Does the grill stay hot? A curious statistics teacher wondered how fast his gas grill cools off once it has been turned off. He recorded the grill's thermometer reading at several times and used a linear model to predict y = grill temperature (in degrees Fahrenheit) from time (in minutes) elapsed since the grill was turned off. Here is the residual plot for that model. Use it to determine whether the regression model is appropriate

Answer 1

The regression model is not appropriate because the pattern of the residual plot follows a non-random U-shaped curve hence, it would be better for the Statistics teacher to used a nonlinear model instead of a linear model.