Imagine We Conduct a One-Way Independent ANOVA with Four Levels

Multiple Choice

Imagine we conduct a one-way independent ANOVA with four levels on our independent variable and obtain a significant result. Given that we had equal sample sizes, we did not make any predictions about which groups would differ before the experiment and we want guaranteed control over the Type I error rate, which would be the best test to investigate which groups differ?

A) Hochberg's GT2
B) Helmert
C) Orthogonal contrasts
D) Bonferroni