Why should you use ANOVA instead of several t tests to evaluate mean differences when an experiment consists of three or more treatment conditions?
Answer to relevant QuestionsPosttests are done after an ANOVA. a. What is the purpose of posttests? b. Explain why you do not need posttests if the analysis is comparing only two treatments. c. Explain why you do not need posttests if the decision from ...For the preceding problem you should find that there are significant differences among the three treatments. One reason for the significance is that the sample variances are relatively small. To create the following data, we ...The endorphins released by the brain act as natural painkillers. For example, Gintzler (1980) monitored endorphin activity and pain thresholds in pregnant rats during the days before they gave birth. The data showed an ...Example 13.1 in this chapter described a twofactor study examining performance under two audience conditions (factor B) for high and low self-esteem participants (factor A). The following summary table presents possible ...A published report of a repeated-measures research study includes the following description of the statistical analysis. "The results show significant differences among the treatment conditions, F(3, 21) = 6.10, p , .01." a. ...
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