A major razor blade manufacturer advertises that its twin-blade disposable razor "gets you lots more shaves" than any single-blade disposable razor on the market.
A rival company that has been very successful in selling single-blade razors plans to test this claim. Independent random samples of eight single-blade users and eight twin-blade users are taken, and the number of shaves that each gets before indicating a preference to 88change blades is recorded.
Do the data support the twin-blade manufacturer's claim? ?=.05. This is a t-test: Two-sample independent groups assuming equal variances.
| Twin Blades |
Single Blades |
| 8 |
10 |
| 17 |
6 |
| 9 |
3 |
| 11 |
7 |
| 15 |
13 |
| 10 |
14 |
| 6 |
5 |
| 12 |
7 |