Question: A researcher is attempting to determine the effects of practice and gender on a timed task. Participants in an experiment are given a computerized search task. They search a computer screen of various characters and attempt to find a particular character on each trial. When they find the designated character, they press a button to stop a timer. Their reaction time (in seconds) on each trial is recorded. Subjects practice for 2, 4, or 6 hours and are either female or male. The reaction time data for the 30 subjects appear here.

Women Men

2 Hours 12 11

13 12

12 13

11 12

11 11

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4 Hours 10 8

10 8

10 10

8 10

7 9

6 Hours 7 5

5 6

7 8

6 6

7 8

Source df SS MS F

Gender 0.027

Practice 140.60

Gender x Practice 0.073

Error 28.00

Total 168.70

1. Complete the ANOVA summary table. (to calculate the sums of squares, use the preceding data to do so.)
2. Are the values of F obt significant at α = .05? at α = .01?
3. What conclusions can be drawn from the F-ratios?
4. What is the effect size, and what does this mean?
5. Graph the means.

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