The relationship between adjusted p values and number of genes tested. a) t-statistics; b) Welch statistics. Colored lines are genes ordered by their unadjusted p values, e.g. gene1 has the smallest unadjusted p value and gene600 has the 600th smallest unadjusted p value. c) A comparison of panel a) and b). Red lines represent the results of Welch statistics and black lines represent the results of t-statistics.