# Question: The following data represent more extended measurements of monthly water

The following data represent more extended measurements of monthly water usage at the plant referred to in Exercise 14.98 over a period of 20 months:

(a) Use an appropriate computer program to fit a linear surface to these data.

(b) Use a computer program to make a normal-scores plot of the residuals. Does the assumption of normality appear to be satisfied at least approximately?

(c) Plot the residuals against and determine whether the pattern is random.

(d) Check for excessive multicollinearity among the independent variables.

(a) Use an appropriate computer program to fit a linear surface to these data.

(b) Use a computer program to make a normal-scores plot of the residuals. Does the assumption of normality appear to be satisfied at least approximately?

(c) Plot the residuals against and determine whether the pattern is random.

(d) Check for excessive multicollinearity among the independent variables.

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