image 13.30 Comparing the groups. Refer to Exercises 13.28 and 13.29. The researchers presented a table of means with different superscripts indicating pairs of means that differed at the 0.05 significance level, using the Bonferroni method.

  1. (a) What denominator degrees of freedom would be used here?

  2. (b) How many pairwise comparisons are there for this problem?

  3. (c) Perform these comparisons using t** = 2.94 and summarize your results.