Students in a large section of a biology class have been randomly assigned to one of two graduate students for the laboratory portion of the class. A random sample of final examination scores has been selected from students supervised by each graduate student, with the following results. (Use data file XR12028.)

a. What are the null and alternative hypotheses for this test?
b. Use ANOVA and the 0.01 level of significance in testing the null hypothesis identified in part (a).

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Grad Student A 78 78 71 89 80 93 73 76 Grad Student B 74 81 65 73 80 63 71 64 50 80