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# Statistics

## Why is it interesting?

For many extremely illuminating visualizations, see http://students.brown.edu/seeing-theory/

• Probability is starting with an animal, and figuring out what footprints it will make
• Statistics is seeing a footprint, and guessing the animal.

Probability is straightforward: you have the bear. Measure the foot size, the leg length, and you can deduce the footprints. "Oh, Mr. Bubbles weighs 400lbs and has 3-foot legs, and will make tracks like this." More academically: "We have a fair coin. After 10 flips, here are the possible outcomes."

Statistics is harder. We measure the footprints and have to guess what animal it could be. A bear? A human? If we get 6 heads and 4 tails, what're the chances of a fair coin?#

A Brief Introduction to Probability & Statistics by Kalid Azad

Important related concepts:

## Layman

Explanations in this section should contain no formulas, but instead colloquial things like you would hear them during a coffee break or at a cocktail party.

## Researcher

• Data Analysis in High Energy Physics: A Practical Guide to Statistical Methods by Olaf Behnke et. al.
Common Question 1
Common Question 2

Example1
Example2: