8033823
Description
Flashcards by Alex Burden, updated more than 1 year ago
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Created by Alex Burden
over 7 years ago
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| Question | Answer |
| E(X+Y)= | E(X)+E(Y) |
| E(X-Y)= | E(X)-E(Y) |
| E(aX+bY) = | aE(X)+bE(Y) |
| If X & Y are independent E(XY)= | E(X)E(Y) this does not mean that X & Y are independent! |
| E(X^2Y)= | E(X^2)E(Y) |
| E(X/Y)= | E(X)E(1/Y) |
| Var(X+Y)= | Var(X)+Var(Y) |
| Var(X-Y)= | Var(X)-Var(Y) |
| Var(XY)= | E(X^2)E(Y^2)-E^2(XY) |
| Var(aX±bY)= | a^2Var(X)+b^2Var(Y) |
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