Example 12.6 presented the residuals from a simple linear regression of moisture content...

Example 12.6 presented the residuals from a simple linear regression of moisture content y on filtration rate x.

a. Plot the residuals against x. Does the resulting plot suggest that a straight-line regression function is a reasonable choice of model? Explain your reasoning.

b. Using s = .665 , compute the values of the standardized residuals. Is or are the e^*_i’s not close to being proportional to the e_i’s?

c. Plot the standardized residuals against x. Does the plot differ significantly in general appearance from the plot of part (a)?