Professor Wonka is interested in whether candy influences children's mood. One group of children is recruited to be part of an experimental group, and another group of children is recruited to be part...

Extracted text: Professor Wonka is interested in whether candy influences children's mood. One group of children is recruited to be part of an experimental group, and another group of children is recruited to be part of the control group. Participants in the experimental group each eat 1 candy bar and then report on their mood on a self-report questionnaire. Children in the control condition do not eat anything before reporting on their mood. Here are the data from the two groups: Experimental (candy) group 15 18.3 94.6 n= M= SS= Control group 17 14.5 112.8 Calculate the effect size in terms of the n= M= SS= proportion of variance accounted for (r-).