Question

A study investigated the effects of physical fatigue on the performance of professional tennis players. Researchers...

A study investigated the effects of physical fatigue on the performance of professional tennis players. Researchers measured the number of unforced errors committed by a random sample of 12 professional tennis players during the first three sets of a match. They hypothesized that increased fatigue would be associated with a greater number of errors. The following is an F-table for this hypothetical study using the one-way within-subjects ANOVA.

Source of Variation SS df MS Fobt
Between groups 15
Between persons 4
Within groups (error) 55
Total

(a) Complete the F-table.

Source of
Variation
SS df MS Fobt
Between
groups
15
Between
persons
4
Within
groups (error)
55
Total

Make a decision to retain or reject the null hypothesis. (Assume alpha equal to 0.05.)

Retain the null hypothesis.

Reject the null hypothesis.

(b) Estimate effect size using partial omega-squared: ωP2. (Round your answer to two decimal places.)
ωP2 =

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