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

Question:

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 e*i  ei /s for i  1, . . . , n, or are the e*is not close to being proportional to the eis?

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

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