Below are 4 different box plots comparing a control group to two different treatments. All have the same number of observations in each group. Decide which would produce the largest and smallest F statistics for an ANOVA test.

Hint: F = MSB/MSW where MSB is the mean squares between groups and MSW is the mean squares within groups. Look at how these are defined in terms of sample means and SDs of the groups and ask yourself what makes them larger and what makes them smaller.

- 1 A. H control treatment I treatment? control treatment I treatment 2 -1 C. H D. control treatment / treatment 2 control treatment I treatment