12.7

a. Construct a scatter plot.

b. Assuming a linear relationship, use the least-squares method to determine the regression coefficients b0 and b1.

c. Interpret the meaning of the slope, b1, in this problem.

d. Predict the mean tear rating when the plate gap is equal to 0.

e. What should you tell management of Starbucks about the relationship between the plate gap and the tear rating?

Plate Gap 0.00 0.00 1.80 1.80 0.00 0.00 0.00 0.00 0.00 -1.80 -1.80 3.00 -1.80 0.00 -3.00 -1.80 1.80 1.80 0.00

Tear 0.00 0.00 0.45 0.85 0.35 0.30 0.70 1.90 0.25 0.10 0.15 3.90 0.00 0.55 0.00 0.05 0.40 4.30 0.00

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