Question: Jefferson State College has received a grant to compare the effectiveness of two innovating teaching methods, audio-tutorial and computer based, using a third group taught through a traditional lecture-based technique as a control group. All three groups are composed of randomly selected biology students enrolled in BIO187L. At the end of the semester, all students will be given Form B of the Test of Biological Concepts which consists of 250 multiple-choice items covering the general content of the course.

1. Select and justify your choice of a statistical procedure to test the hypothesis that "there
   will be no significant differences among the means of the three groups on the test at the end of the course."
2. Investigate "post hoc" or multiple comparisons. Determine under what conditions they
   have application to the above null hypothesis.
3. If the assumption of random selection equating the three groups for pre-existing

knowledge of the discipline is not tenable, determine an alternative strategy to be used including the selection of statistical procedure.

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