Five subjects' before/after weights (lb): (180,178), (200,196), (165,167), (210,205), (175,170).
Using d = before - after, what is the mean difference?
- A
1.5
- B
5.0
- C
-2.8
- Dcheck_circle
2.8
Explanation
Differences: 2, 4, -2, 5, 5. Mean = (2+4-2+5+5)/5 = 14/5 = 2.8.