Refer to Exercise 12.56. a. Predict the feedlot time required for a steer fed 15% p...

Refer to Exercise 12.56.

a. Predict the feedlot time required for a steer fed 15% protein, 1.5% antibiotic concentration, and 5% supplement.

b. Do these values of the independent variables represent a major extrapolation from the data?

c. Give a 95% confidence interval for the mean time predicted in part (a).

REFERENCE:

12.56 : 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:

Computer output from a Systat regression analysis follows:

a. Write the regression equation.

b. Find the standard deviation.

c. Find the value.

d. How much of a collinearity problem is there with these data?