Attempts: 3 Average: 3/4 6. Effect size and ANOVA Aa Aa Amit Almor, a psychology

Question

Attempts: 3 Average: 3/4 6. Effect size and ANOVA Aa Aa 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. Group Sample Mean Sum of Squares Preparing to speak 98.3 7, 2810.0900 Speaking 101.5 6,6156, 8100 Listening 103.2 70,277.7600 After collecting the data, you analyze the data using an ANOVA. The results of your analysis are presented in the following ANOVA table. ANOVA Table source of Variation MS Between Treatments 3,095.00 1,547.50 5.52 Within Treatments 209,244.66 747 280.11 Total 212,339.66 749 A These findings are significant at a .01, 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 The Scheffc test Cohen's d what is the formula for this measure of the effect size? ATU key's HSD test Q MSbetween/MSwithin Q MSbetween/MStotal

Explanation / Answer

Part-a

The effect size 2

Part-b

The effect size 2=SSbetween/SSTotal

Part-c

The effect size 2=3095/212339.66 =0.0146

Part-d

1.46%

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