8.31. Consider the isatin yield data from the experiment described in Problem 6.38. The original experiment was a 24 full factorial. Suppose that the original 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 Example 6.38. Analyze the data and draw conclusions. Compare your findings with those from the full factorial in Example 6.38.