Consider the experiment and data in Exercise 11.9.3.The experiment wise 95% Tukey HSD intervals are displayed using the statistical software package R.

(a) Using the preceding output to support your answer, is there evidence that each of the groups/diets B, C, and D, differs from the control. A?
(b) According to the preceding Tukey HSD intervals and summary of the data in Exercise 11.9.3, diet C yields the greatest mean selenium concentration and is significantly higher than the control. If the goal of the researchers is to find a diet that maximizes selenium concentration, is diet C the clear choice? That is, should we rule out diet B, diet D, or both? Refer to the Tukey HSD intervals to justify your answer.

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