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.

a. Complete the ANOVA summary table. (If your instructor wants you to calculate the sums of squares, use the preceding data to do so.)

b. Are the values of Fobt significant at a 5 .05? At α = .01?

c. What conclusions can be drawn from the F-ratios?

d. What is the effect size, and what does this mean?

e. Graph the means.

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Women Men 2 Hours 12 11 13 12 12 13 11 12 11 11 4 Hours 10 10 10 10 8. 10 9. 6 Hours 5 6. 6. 8. MS Source df Gender Practice Gender x Practice Error 0.027 140.60 0.073 28.00 168.70 Total