A producer of various feed additives for cattle conducts a study of the number of days of feedlot time required to bring beef cattle to market weight. Eighteen steers of essentially identical age and weight are purchased and brought to a feedlot. Each steer is fed a diet with a specific combination of protein content, antibiotic concentration, and percentage of feed supplement. The data are as follows:

a. Obtain the regression equation relating feedlot time to the three diet variables.
b. Find the value of e.
c. Find the R2 value.
d. How much of a collinearity problem is there with these data?

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