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. Participants practice for 2, 4, or 6 hours and are either male or female. The reason time data for the 30 participants appear here:

Women Men
2 hours 12 11
13 12
12 13
11 12
11 11
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

a. Complete the ANOVA summary table, including the sums of squares

b. Are the values of F_obt significant at α = .05?

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

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

e. Graph the means