Exercise 11: Analysis of Variance (ANOVA) As preparation for this exercise, you are strongly advised do the Time to Practice exercise 1 and 4 in chapter 13, and check your work against the correct answers in the text. Test the hypothesis that the three groups differ from average in their levels of post-test aggression. 1. State the null and research hypotheses: 2. Set the level of significance, or Type 1 error, and explain what it means. 3. Select the appropriate test statistic, and explain why it is appropriate. Describe the formula (13.1) for the statistic and what it means. 4. Compute the test statistic to get the ‘obtained value’. Note: compute all terms to enter into the formula, and plug them into the equation, as on pages 228-230. Then, use SPSS to compute the test statistic. 5. Find the critical value of the statistic from the appropriate table. 6. Compare the obtained and critical value. 7. What do you conclude about your hypothesis, and why? Also, indicate your decision in notational form indicating the test statistic and p value. 8. Did you use a one or two tailed test? Justify your choice. Show the computations you did in a spreadsheet, and include a copy of the SPSS printout with your assignment. The spreadsheet should show all steps in the computations as displayed on pages 229-230.

Subject | Mathematics |

Due By (Pacific Time) | 04/11/2013 08:00 am |

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