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To test the effectiveness of a business school preparation course, 8 students took a general business test before and after the course.

To test the effectiveness of a business school preparation course, 8 students took a general business test before and after the course. Referring to Table 10-5, the value of the standard error of the difference scores is (look at excel sheet).

A 65.027
b 60.828
c 22.991
d 14.696

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