Jadkie Andrade, a psychology professor at the University of Plymouth, conducted

Question

Jadkie Andrade, a psychology professor at the University of Plymouth, conducted a study regarding the impact on attention of simple activities such a conversation were able to recall more details of the conversation than those who were not doing anything. dood ing. She found that research partidpants who dood ed while listening to a ou decice to explore this issue by having three different groups try recalling details from a conversation. The first group is doing a math problem, the second group is not doing anything, and the third group is dooding. The sample mean and sum of squares of the scores for each of the three groups are presented in the foilowing table. Sample Mean Sum of Squares Group Doodling No activity Math problem 94.1 108.7 111.4 9,467.2900 7,903.2100 8,667.6100 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 df 2 147 149 MS 4,331.17 177.13 Betuween Treatments 8602 34 24.45 26,038.11 34,700.45 Within Treatments Total

Explanation / Answer

A simple measure for effect size is eta square = SSbetween/SStotal

The formula for measure the effect size is (eta square) = SSbetween/SStotal

Therefore effect size = 8662.34/34700.45 = 0.25

Effect size = 0.25

The percentage of variability in the scores accounted for by the effect due to treatments is = SSbetween/SStotal = 0.25 = 25%

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