Please see attached file for problem description.
a). Make a scatterplot of these data (in excel). The relationship appears to be approximately linear, but the wide variation in the response values makes it hard to see detail in this graph.
b). Compute the least-squares regression line of y on x, and plot this line on your graph.
c). Now compute the residuals and make a plot of the residuals against x. It is much easier to see deviations from linearity in the residual plot. Describe carefully the pattern displayed by the residuals.
The expert uses a scatterplot to examine a regression line. A Complete, Neat and Step-by-step Solution is provided in the attached file.