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Question
Exhibit 10-3A statistics teacher wants to see if there is any difference in the abilities of students enrolled in statistics today and those enrolled five years ago. A sample of final examination scores from students enrolled today and from students enrolled five years ago was taken. You are given the following information.
| Today | Five Years Ago | |
 | 82 | 88 |
 | 112.5 | 54 |
| n | 45 | 36 |
a. 58.5
b. 9
c. -9
d. -6
Answer
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