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Combining Random Variables

Combining Random Variables. Ch.16. Adding/Subtracting a Constant. Add/subtract the constant E ( X ± c ) = E ( X ) ± c Variance doesn’t change Var ( X ± c ) = Var ( X ). Multiplying by a Constant. Multiply by the constant E ( aX ) = aE ( X ) Multiply by the square of the constant

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Combining Random Variables

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  1. Combining Random Variables Ch.16

  2. Adding/Subtracting a Constant Add/subtract the constant • E(X ± c) = E(X) ± c Variance doesn’t change • Var(X ± c) = Var(X)

  3. Multiplying by a Constant Multiply by the constant • E(aX) = aE(X) Multiply by the square of the constant • Var(aX) = a2Var(X)

  4. Combining Random Variables Adding Subtracting Subtracted the expected values E(X - Y) = E(X) - E(Y) Add the variances!!!! Var(X - Y) = Var(X) + Var(Y) Add the expected values • E(X + Y) = E(X) + E(Y) Add the variances • Var(X + Y) = Var(X) + Var(Y) Variances add!!!!

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