I encountered a mixed-design experiment that consisted of two independent groups and three repeated conditions. The authors conducted an analysis of variance followed by post-hoc paired-samples t-tests. Three paired-samples t-tests were computed to compare the conditions within each group (i.e. six tests in total).
In applying the appropriate Bonferroni correction, should the authors correct alpha (0.05) by dividing by three (i.e. the number of comparisons within each group) or six (i.e. the total number of post-hoc comparisons)?