Chapter 3.2, Problem 53E

To determine

To use technology to create a residual plot and sketch the residual plot and explain what information it provides.

Explanation of Solution

Now, we have to create a residual plot for the sugar and the calories. We will use the calculator to plot the residual plot. We will first press on $2nd>Y=$ and press on ENTER to go to plot $1$ . Then make sure that On is selected and the first type of graph is selected. Enter $L_1$ after Xlist and enter RESID after Ylist. Thus, finally pressing on GRAPH then gives us the following result:

  

This implies in the scatterplot that the pattern of the points appears to be random and the pattern does not appear to contain strong curvature which implies that the linear model appears to be appropriate.