A study was conducted 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. Analyze the data using ?=.05. (NEED Minitab instructions: A > B > C > D works fine)
|
No Glycerol |
Glycerol |
| Distilled Water |
165, 181, 168 |
170, 197, 190 |
| Tap Water |
155, 142, 139 |
139, 160, 160 |