Question 14.49

14.49 Additional ANOVA for the moral strategy example.

Refer to Case 14.1 (page 715) for a description of the study. In addition to rating the likelihood to continue to purchase products, each participant was also asked to judge the CEO’s degree of immorality. This was done by answering a couple questions on a 0–7 scale where the high the score, the stronger the immorality.

moral1

  1. Use numerical and graphical methods to describe the three populations.
  2. Examine the conditions necessary for ANOVA. Summarize your findings.
  3. Run the ANOVA and report the results.

14.49

(a)

Immorality
Level of
Grp		 Mean Std Dev
C 41 6.4512 0.5788
D 43 6.2209 0.8040
R 37 5.6892 1.2767

(b) There is no reason to believe the cases are not independent. Constant variance is violated: the largest is more than twice the smallest , . The sample sizes are large enough that the sample means should be approximately Normally distributed. ANOVA should not be used because the standard deviations are too different to be assumed equal. (c) not all of the are equal, . There are significant immorality judgment differences among the three groups.