For the previous problem, you should have found that there are significant differences among the three...

For the previous problem, you should have found that there are significant differences among the three treatments. The primary reason for the significance is that the mean for treatment I is substantially smaller than the means for the other two treatments. To create the following data, we started with the values from problem 6 and added 3 points to each score in treatment I. Recall that adding a constant causes the mean to change but has no influence on the variability of the sample. In the resulting data the mean differences are much smaller than those in problem 6. I II III n = 6 n = 6 n = 6 M = 4 M = 5 M = 6 N = 18 T = 24 T = 30 T = 36 G = 90 SS = 30 SS = 35 SS = 40 ΣX2 = 567 a. Before you begin any calculations, predict how the change in the data should influence the outcome of the analysis. That is, how will the F-ration and the value of η 2 for these data compare with the values obtained in problem 6? b. Use an ANOVA with α = .05 to determine whether there are any significant differences among the three treatment means. (Does your answer agree with your prediction in part a?) c. Calculate η 2 to measure the effect size for this study. (Does your answer agree with your prediction in part a?)

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orchestra answered 2 years ago

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