A pharmaceutical company is testing a new cognition control drug called mathene. Twenty four students were broken into two groups, depending on how many hours per week that they studied statistics outside of the classroom.
One group studied between 0 - 15 hours a week and the other group studied between 15 - 30 hours a week.

Each of these groups was then broken into three subgroups. Subgroup 1 received no mathene, subgroup 2 received 10 mg. and subgroup 3 received 20 mg.

Here are the test results:

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