An educational researcher wanted to test whether rewards influence the disruptive behavior of youngsters. The researcher assigned some youngsters to a concrete reward group, others to a verbal reward group, and another group received no reward. The number of misbehaviors each youngster engaged in was recorded. Does the reward make a difference in behavior? Use alpha = 0.05. The psychologist's data are as follows:

Concrete Reward Verbal Reward No Reward
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12 8 15
10 6 13
14 9 16
11 7 14
13 5 12

Null Hypothesis: