Consider Exercise 11-46. With the assignment of factors A, B, C, and D to columns 1, 2, 3, and 4, respectively, of an L9 orthogonal array, the output is as follows for another replication of the nine experiments:

Determine the main effects. Plot the average response curves. What are the optimal settings of the design parameters?

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Experiment 1 2 3 4 5 6 7 8 9 Barrels per Day (thousands) 12.2 18.3 13.5 8.3 17.2 7.5 7.9 15.7 14.8