## Statistics and Probability Background

Stats: Probability Rules

“I like to use what’s called a **joint probability distribution.** (Since **disjoint** means nothing in common, **joint** is what they have in common — so the values that go on the inside portion of the table are the** intersections or “and”s of each pair of events).** “**Marginal” is another word for totals** — *it’s called marginal because they appear in the margins.”*

The UBC Calculus Online Homepage — short intro

**probability density**

n. Statistics In both senses also called probability distribution.

1. A function whose integral over a given interval gives the probability that the values of a random variable will fall within the interval.

2. The calculated value of a probability density.

John Sowa — mathamatical background

paskin.org — some useful presentations on probability and structured representation

<a href="http://en.wikipedia.org/wiki/Standard_score“>Standard (Z) Score