Amit Almor, a psychology researcher at the University of South Carolina, conduct

Question

Amit Almor, a psychology researcher at the University of South Carolina, conducted a series of experiments on conversation and attention level. He found that subjects were four times more distracted while preparing to speak or speaking than when they were listening. This research has implications for the issue of using cell phones while driving, as well as for many other areas. You decide to explore this issue by having three different groups try detecting visual shapes on a monitor. The first group is preparing to speak, the second group is speaking, and the third group is listening to a conversation. The sample mean and sum of squares of the scores for each of the three groups are presented in the following table. After collecting the data, you analyze the data using an ANOVA The results of your analysis are presented in the following ANOVA table. These findings are significant at alpha = .05, which tells you that the difference is very unlikely to have occurred just by chance, but it does not tell you the size of the effect. A simple measure of the effect size is given by ___. What is the formula for this measure of the effect size? Ms_between/MS_total SS_between/SS_total SS_between/SS_wthin MS_between/MS_within Based on the data given, the effect size is ___. The percentage of variability in the scores accounted for by the effect due to treatments is ___ .

Explanation / Answer

The formula for effect size is = SSbetween / SStotal

The effect size is = 8662.34 / 34700.45 = 0.25

The percentage of variability in the score accounted for the effect due to treatment is 25%

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