For independent X, Y: Var(X − Y) =
- A
Var(X) · Var(Y)
- Bcheck_circle
Var(X) + Var(Y)
- C
0
- D
Var(X) − Var(Y)
Explanation
Variances always add (or multiply by a², when scaling) for independent RVs.
Combining Random Variables
AP Statistics· difficulty 4/5
Want 10 more like this — adaptive to your weak spots?