A researcher is interested in the effects of practice on accuracy in a signal-detection task. Subjects are tested with no practice, after 1 hour of practice, and after 2 hours of practice. Each person participates in all three conditions. The following data indicate how many signals each participant detected accurately at each level of practice.

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. Is Fobt significant at α = .05? at α = .01?

c. Perform post hoc comparisons if necessary.

d. What conclusions can be drawn from the F-ratio and the post hoc comparisons?

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

f. Graph the means.

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Amount of Practice 1 Hour Subject No Practice 2 Hours 3 2 4 5 3 3 4 4 3 5 3 3 4 3 4 MS Source Subject Between Error Total df 16.27 25.81 4.87 46.95 46.95