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A professor randomly picks four students and asks them to complete two ten-quest...
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A professor randomly picks four students and asks them to complete two ten-question quizzes: one before a tutorial and one after it. The number of correctly answered questions is given below.
| | Before tutorial | After tutorial |
| Jill | 5 | 8 |
| John | 9 | 10 |
| Jane | 6 | 7 |
| Jack | 4 | 6 |
Assuming both populations are normally distributed, the value of the test statistic for the difference in correctly answered questions before and after the tutorial is...
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