Average: 3 2. Gravetter/Wallnau Essentials - Chapter 12- End-of-chapter question

Question

Average: 3 2. Gravetter/Wallnau Essentials - Chapter 12- End-of-chapter question 4 Aa Aa Posttests are done after an ANOVA. What is the purpose of posttests? O To minimize the risk of a Type I error O To check the accuracy of the ANOVA calculations O To estimate the size of the effect O To determine exactly which treatment conditions are significantly different Explain why you would not do posttests if the decision from the ANOVA was to fail to reject the null hypothesis. O You would avoid posttests to minimize the risk of a Type II error. O There are no significant differences to test for. O You already know which treatments would be different. O Posttests are not able to detect honestly significant differences. Explain why you would not do posttests if the analysis is comparing only two treatments. O There are no significant differences to test for O Posttests are not able to detect honestly significant differences. You would avoid posttests to minimize the risk of a Type II error. You already know which treatments would be different.

Explanation / Answer

what is the purpose of posttests?

To determine exactly which treatment conditions are significantly different

Explain why you would not do the posttest if the decision fron the ANOVA was to fail to reject the null hypothesis

There are no significant differences to test for

Explain why you would not do posttests if the analysis is comparing only two treatements

you already know which treatments would be different

if there are only 2 treatments, then there is only one pair of treatments. so the ANOVA should yield the same results as a t test

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