Hoaglin, Mosteller, and Tukey (1983) presented data on blood levels of beta-endorphin as a function of stress. They took beta-endorphin levels for 19 patients 12 hours before surgery and again 10 minutes before surgery. The data are presented below, in fmol/ml Construct a 95% confidence limits on the true mean difference between endorphin levels at the two times described. Participant 12 hours before 10 minutes before 1 10 6.5 2 6.5 14.0 3 8.0 13.5 4 12 18 5 5.0 14.5 6 11.5 9.0 7 5.0 18.0 8 3.5 42.0 9 7.5 7.5 10 5.8 6.0 11 4.7 25.0 12 8.0 12.0 13 7.0 52.0 14 17.0 20.0 15 8.8 16.0 16 17.0 15.0 17 15.0 11.5 18 4.4 2.5 19 2.0 2.0
Hoaglin, Mosteller, and Tukey (1983) presented data on blood levels of beta-endorphin as a
Construct a 95% confidence limits on the true mean difference between endorphin levels at the two times described.
Participant 12 hours before 10 minutes before
1 10 6.5
2 6.5 14.0
3 8.0 13.5
4 12 18
5 5.0 14.5
6 11.5 9.0
7 5.0 18.0
8 3.5 42.0
9 7.5 7.5
10 5.8 6.0
11 4.7 25.0
12 8.0 12.0
13 7.0 52.0
14 17.0 20.0
15 8.8 16.0
16 17.0 15.0
17 15.0 11.5
18 4.4 2.5
19 2.0 2.0
| Participant | 12 hours before(X) | 10 minutes before (Y) |
| 1 | 10 | 6.5 |
| 2 | 6.5 | 14 |
| 3 | 8 | 13.5 |
| 4 | 12 | 18 |
| 5 | 5 | 14.5 |
| 6 | 11.5 | 9 |
| 7 | 5 | 18 |
| 8 | 3.5 | 42 |
| 9 | 7.5 | 7.5 |
| 10 | 5.8 | 6 |
| 11 | 4.7 | 25 |
| 12 | 8 | 12 |
| 13 | 7 | 52 |
| 14 | 17 | 20 |
| 15 | 8.8 | 16 |
| 16 | 17 | 15 |
| 17 | 15 | 11.5 |
| 18 | 4.4 | 2.5 |
| 19 | 2 | 2 |
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