Eleven short guides to basic statistical concepts, designed for journalists and others who did not major in math.

**Mean**: Let's get started.

**Median**: How to find out how the "average Joe" is doing.

**Mode**: Who's popular?

**Percent**: Looking for changes.

**Per capita and Rates**: When an increase is really a decrease, and other ways people can use numbers to trick you.

**Standard Deviation and Normal Distribution**: A quick look at the King of Stats.

**Survey Sample Sizes and Margin of Error**: How not to get suckered by polls and other research.

**Regression Analysis**: It's all about relationships.

**Data Analysis**: How to tell if these numbers are really worth writing about anyway.

**Statistical Tests**: How do I pick the correct statistical test?

**Student's T**: Is your sample relevant to the larger population it is supposed to represent?

© Robert Niles. Read more in the column archive.