FIGURE 8-
Statistical Power: The Whole Picture
Now we can visualize statistical power in the context of two populations. Statistical power is the percentage of the distribution of means for population 1 that is above the cutoff. Here the statistical power is 45.62%. Alpha (α) is the percentage of the distribution of means for population 2 that is above the cutoff; alpha is set by the researcher and is usually 0.05, or 5%.
Statistical Power: The Whole Picture
Now we can visualize statistical power in the context of two populations. Statistical power is the percentage of the distribution of means for population 1 that is above the cutoff. Here the statistical power is 45.62%. Alpha (α) is the percentage of the distribution of means for population 2 that is above the cutoff; alpha is set by the researcher and is usually 0.05, or 5%.