In a study of the dietary treatment of anemia in cattle, researchers randomly divided 144 cows into tour treatment groups. Group A was a control group, and groups B, C, and D received different regimens of dietary supplementation with selenium. After a year of treatment, blood samples were drawn and assayed for selenium. The accompanying table shows the mean selenium concentrations (pg/dl).36 The MS(within) from the ANOVA was 2.071.

(a) Compute three Bonferroni-adjusted intervals comparing diets B, C, and D to the control (diet A) using aew = 0.05. (This is an example of a situation for which the Bonferroni comparisons may be preferred over the Tukey HSD comparisons since not all comparisons are considered -we are only interested in comparing the control to each of the other three treatments.)
(b) In the context of the problem, interpret the Bonferroni interval computed in part (a) that compares the control (group A) to the group that is most different from it.

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