Question: Construct and interpret an interaction plot for the data in Exercise 19. Exercise 19 A study was done to determine the effects of two factors

Construct and interpret an interaction plot for the data in Exercise 19.

Exercise 19

A study was done to determine the effects of two factors on the latherability of soap. The two factors were type of water (tap or distilled) and glycerol (present or absent). The outcome measured was the amount of foam produced (in milliliters). The experiment was repeated three times for each combination of the factors. The results are as follows. Distilled Water Tap Water No Glycerol 165 181 168 155 142 139

Distilled Water Tap Water No Glycerol 165 181 168 155 142 139 Glycerol 170 197 190 139 160 160

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