After the Enron scandal in the fall of 2001, faculty in accounting began to incorporate ethics more into accounting courses. One study looked at the effectiveness of such educational intervention “pre-Enron” and “post-Enron.” The data below shows students’ improvement in score on the Accounting Ethical Dilemma Instrument (AEDI) across a one-semester accounting class in Spring 2001 (“pre-Enron”) and another in Spring 2002 (“post-Enron”). (From “A Note in Ethics Educational Interventions in an Undergraduate Auditing Course: Is There an ‘Enron Effect’?” Issues
Account. Educ. 2004: 53–71.)

a. Test to see whether the 2001 class showed a statistically significant improvement in AEDI score across the semester.
b. Test to seewhether the 2002 class showed a statistically significant improvement in AEDI score across the semester.
c. Test to see whether the 2002 class showed a statistically significantly greater improvement inAEDI score than the 2001 class. In this respect, does there appear to be an “Enron effect”?

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Class 2001 (pre-Enron) 2002 (post-Enron) n 37 21 Improvement in AEDI score Mean 5.48 6.31 SD 13.83 13.20