Do workbooks make a difference in students’ performance? A statistics instructor uses her class as a sample. Do the results suggest that the grade patterns of those who own a workbook and of those who do not are different? Do a 5 % test.

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Own a workbook Don't own a workbook Grade A 5 2 B 96 4 6 C 6 4 D 2 WN 3 [L F 1 71 2