A researcher examines performance on an eye€“hand coordination task as a function of three levels of reward and three levels of practice, obtaining the following cell means:

(a) What are the main effect means for reward, and what do they appear to indicate about this factor?
(b) What are the main effect means for practice, and what do they appear to indicate?
(c) Does it appear that there is an interaction effect?
(d) How would you perform unconfounded post hoc comparisons of the cell means?

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Reward Low Medium High 10 4 Low 14 Practice Medium High 15 15 15