Question: Two tutoring services offer crash courses in preparation for the CPA exam. To check on the effectiveness of these services, 15 students were chosen. Five

Two tutoring services offer crash courses in preparation for the CPA exam. To check on the effectiveness of these services, 15 students were chosen. Five students were randomly assigned to service A, 5 were assigned to service B, and the remaining 5 did not take a crash course. Their scores on the examination, expressed as percentages, are given in the table.

a. Prepare the analysis of variance table.
b. Test the null hypothesis that the three population mean scores are the same.
c. Compute the minimum significant difference and indicate which subgroups have different means.

Service A Course Service B Course Course 8

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