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Three composition instructors recorded the number of spelling errors their students made on a research paper. The data are shown below. At α = 0.01, there a significant difference in the average number of error per instructor? Assume the number of errors is normally distributed. Instructor 1 Instructor 2 Instructor 3 2 4 5 3 6 2 5 8 3 0 4 2 8 9 3 0 3 2

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