Pet preference was compared for four different types of anim

Pet preference was compared for four different types of animals (dogs, cats, birds, and fish), using a one-way within-groups ANOVA with seven participants. The standard error was calculated as 0.21. Given the following means for preference, what is the Tukey HSD value when comparing data for birds and fish?

Dogs M = 4.43, Cats M = 4.18, Birds M = 2.73, Fish M = 4.07

A) -7.135