(c) Analyze the experiment as a product array, and calculate the sample average and the log sample variance percentage of popped kernels for each brand-oil combi-

nation. Draw AB interaction plots similar to those of Figure 7.9, page 223. If the goal of the experiment is still to find brand-oil combinations that give a high per-

centage of edible kernels and that are not too sensitive to the popping time, what recommendations would you make? How do your recommendations compare with those that you made in part (a)?

Consider the paper towel strength experiment of Exercise 8, page 234. The 24 observations are shown in Table 7.20.