Factors Affecting Power: Significance Level (2 of 2)
Next section: Sample size
The power for the three values of μdiff at the two significance levels is shown below.
μdiff |
0.05 |
0.01 |
10 20 30 |
0.17 0.52 0.85 |
0.07 0.28 0.66 |
It stands to reason that the power would be higher for the 0.05 level than for the 0.01 level. The cost of stronger protection against Type I errors is more Type II errors.
Next section: Sample size