4. Below is data from a study on 10 subjects. This study was conducted in a world where outcomes can be observed simultaneously. Calculate the individual (unit-level) causal effects and the average causal effect.

Individual Weight Change (%) on Treatment Weight change (%) on control

1 - 5.4 - 1.6

2 - 3.0 3.1

3 - 7.8 1.3

4 4.7 2.8

5 3.9 - 5.8

6 - 8.7 7.5

7 - 3.2 - 0.3

8 - 1.6 - 8.9

9 - 2.2 - 6.8

10 - 11.0 0.0