A consumer researcher gave consumers a sample shampoo. After using the
shampoo, each consumer used an interval-level scale to rate his or her satisfaction with it. Scores could range from 0 to 100, with higher scores indicating greater satisfaction. Consumers didn’t know each other and were randomly assigned to three groups: (1) receive a store brand of shampoo in a bottle clearly labeled as such, (2) receive a premium brand of shampoo in the premium brand’s bottle, or (3) receive a store brand of shampoo in the premium brand’s bottle. Here are the collected data:
| Store brand, store bottle | Premium brand, premium bottle |
Store brand, premium bottle |
| 70 | 85 | 85 |
| 65 | 90 | 80 |
| 65 | 95 | 90 |
| 60 | 90 | 85 |
| M = 65 s = 4.08 |
M = 90 s = 4.08 |
M = 85 s = 4.08 |
SSbetween = 1400
a. What test will you do?
b. What are the hypotheses?
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