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A lower α, or significance level, would require much bigger sample sizes, making many studies impossible.

Asterisks denote the Bonferroni-adjusted significance level from a two-sided t-test of the difference between the gDNA and cDNA alternate allele proportions: ·P < 0.05, *P < 0.01, **P < 0.001.

Asterisks denote the Bonferroni-adjusted significance level from a two-sided t-test of the difference between the gDNA and cDNA alternate allele proportions: ·P < 0.05, *P < 0.01, **P < 0.001.

A two-sample t-test was performed to a significance level of P < 0.05.

“Within testing years, the enrollment drop rate observed at Success Academy is greater than the enrollment drop rates at next door public schools 70% of the time. Furthermore, in 61% of these cases, this difference is so large that we can reject the hypothesis that it occurred due to random variation in attrition rates, at the 5% significance level.”