EXAMPLE 12.29
Changing the sample size. To decide on an appropriate sample size for the experiment described in the previous example, we repeat the power calculation for different values of n, the number of subjects in each group. Here are the results:
| n | DFG | DFE | F* | l | Power |
|---|---|---|---|---|---|
| 20 | 2 | 57 | 3.16 | 7.35 | 0.65 |
| 30 | 2 | 87 | 3.10 | 11.02 | 0.84 |
| 40 | 2 | 117 | 3.07 | 14.69 | 0.93 |
| 50 | 2 | 147 | 3.06 | 18.37 | 0.97 |
| 100 | 2 | 297 | 3.03 | 36.73 | ͌1 |