Consider the 24 factorial experiment for surfactin production in Problem 6.44. Suppose that the experimenters could only afford eight runs. Set up the 24−1 fractional factorial design with I = ABCD and select the responses for the runs from the full factorial data in Problem 6.44.

(a) Analyze the data and draw conclusions.

(b) Compare your findings with those from the full factorial in Problem 6.44.