12.70 A comparison of different types of scaffold material, continued. Refer to the previous exercise.

  1. (a) Examine the residuals. Is the Normality assumption reasonable for these data?

  2. (b) Use the Bonferroni or another multiple-comparisons procedure to determine which pairs of means differ significantly. Summarize your results in a short report. Be sure to include a graph.

  3. (c) Use a contrast to compare the three ECM materials with the three other materials. Summarize your conclusions. How do these results compare with those that you obtained from the multiple-comparisons procedure in part (b)?