[All Steps] Three groups of 10 rates each are fed diets suspected to affect problem-solving ability. Then they are tested on a series of problems until


Question: Three groups of 10 rates each are fed diets suspected to affect problem-solving ability. Then they are tested on a series of problems until all subjects have achieved criterion on at least two problems. The total number of problems solved by the rats in each dietary group is as follows Group A 33, Group B 22, Group C 25. Assuming that problem-solving ability should be evenly distributed across the groups, do the groups differ?

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