A researcher is interested in how perceptions of global warming influence consumer spending. He selects a sample of 10 environmentalists with strong perceptions of global warming and has them report how much they spend on a variety of "typical" items. These items were categorized as detrimental, safe, or helpful to the environment. The following is an F table for this hypothetical study using the one-way within-subjects ANOVA.

(a) Complete the F table and make a decision to retain or reject the null hypothesis.

(b) Compute effect size using partial eta-squared: η²_P.

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Source of Variation SfMS obt Between groups Between persons Within groups error) Total 198 234 1,278 29