1 / 4

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

zareh
Download Presentation

Combining Random Variables

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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!!!!

More Related