The dean of a business school believes that a good knowledge of economics helps business students do well in other business courses. He randomly pulled out 15 students’ grades in economics and related business courses and ranked them in the accompanying table.

Do a test to determine whether economics grade and grades in other business courses are related. Use 5 percent.

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Economics 7 3 2 4 15 5 10 14 Business 1 6 3 14 4 9 13 Economics 8 13 9 1 11 12 126 Business 10 11 8 2 15 12 7