Chapter 3.2, Problem 47E

To determine

To find: Whether the linear model is appropriate or not by looking at the residual plot.

Answer to Problem 47E

No, it is not appropriate.

Explanation of Solution

Given:

The figure is:

  

Regression equation is:

  $\text{weight}=4.88+0.267\left(\text{age}\right)$

The important property of the appropriate linear regression model is that the data points of the residual plot should follow the linear pattern. Here, in the provided residual plot data points are not forming linear pattern which makes the model inappropriate. In simple words, the presence of curvature in the residual plot implies that the model is not appropriate.