Chapter 4 notes

# Chapter 4 notes - Notes for Chapter 4 from Stat 225 Section...

This preview shows pages 1–2. Sign up to view the full content.

Notes for Chapter 4 from Stat 225 Section 4.1 Conditional Probability Conditional Probability- Let A and B be events. The probability that event B occurs given that event A occurs is called a conditional probability, and it is denoted by: ) ( () PB PA     . The event on the right side is the “given” event. It is read probability of B given A. As long as P(A)>0, you can use the above formula. This works as long as you know the 2 probabilities on the right side. This is very useful in Venn Diagram problems. However, for simpler cases you can also find it by the following: (      This second equation can be used for “simple” examples (examples where N is small, and all outcomes are known and have equal probability). Some examples where this would work would be flipping a coin repeatedly, or rolling a dice 1 or 2 times, etc. Section 4.2 General Multiplication Rule and Law of Total Probability General Multiplication Rule: ( ) ( )* ( P A B P A P B

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

## This note was uploaded on 02/06/2012 for the course STAT 225 taught by Professor Martin during the Spring '08 term at Purdue University-West Lafayette.

### Page1 / 3

Chapter 4 notes - Notes for Chapter 4 from Stat 225 Section...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online