Power with different number of tests. Percentage (%) of power for different number of tests. The family of tests was the one-sample t tests with 20% of them coming from a N(0.36, 1) and sample size 20. Values are averages through 1,000 replicates. Error bars represent standard deviations between replicates. The power is defined as the number of true discoveries divided by the total of existing effects (false null hypotheses).