5. Posttests are done after an analysis of variance.

• What is the purpose for posttests?
• Explain why you would not do posttests if the analysis is comparing only two treatments.
• Explain why you would not do posttests if the decision from the ANOVA was to fail to reject the null hypotheses.

20. The following summary table represents the results from an ANOVA comparing three treatment conditions with n= 8 participants in each treatment. Complete all missing values. (Hint: Start with the df column)

Source                                     SS                    df                     MS

Between treatments                  ___               ____                 20        F = ______

Within treatments                      ___                 ___            ___

Total                                        124                  ____

22. A common science-fair project involves testing the effects of music on the growth of plants. For one of these projects, a sample of 40 newly sprouted bean plants is obtained. These plants are randomly assigned to four treatments, with n= 10 in each group. The four conditions are rock, heavy metal, country and classical music. The dependent variable is the height of each plant after 2 weeks. The data from this experiment were examined using an ANOVA, and the results are summarized in the following table. Fill in all missing values.

Source                                     SS                    df                     MS

Between treatments                  72                 _____                  ____         F = _____

Within treatments                    ___                  ___                 3

Total                                        ___                  ____

SPSS Assignment 1

• Enter the data for Chapter 13, question 8 into SPSS.
• State the null and alternative hypotheses.
• Conduct a one-way ANOVA test at the .05 level.
• Copy or copy object and paste relevant output from the statistical test.
• State whether or not the null hypothesis is accepted or rejected based on the results of the statistical test. Use the conventions described by Gravetter and Wallnau on page 358 to present your report.

SPSS Assignment 2

• Enter the data for Chapter 13, question 23 into SPSS
• State the null and alternative hypotheses
• Conduct a one-way ANOVA test at the .05 level.
• Copy or copy object and past relevant output from the statistical test.
• State whether or not the null hypothesis is accepted or rejected based on the results of the statistical test. Use the conventions described by Gravetter and Wallnau on page 358 to present your report.

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