# One Numerical Variable Methods

• ### **Statistics Every Writer Should Know

This site provides an introduction to basic statistical concepts for journalists and writers with little math background. Key Words: Mean; Median; Percent Changes; Per capita; Rates; Standard Deviation; Normal Distribution; Margin of Error; Confidence Interval; Data Analysis; Sample Sizes; Statistical Tests; Student's T.
• ### Mean

This resource defines and explains the arithmetic mean using an example on employee salaries.
• ### Median

This resource defines and explains the median using an example on employee salaries.
• ### Percent Change

This resource defines and explains percent changes using an example on city murder rates.
• ### Per Capita

This resource defines and explains per capita rates using an example on city murder rates.
• ### Margin of Error

This resource explains margin of error using an example on presidential popularity polls.
• ### Data Analysis

This resource gives 3 questions readers should ask when presented with data and why to ask them: Where did the data come from? Have the data been peer-reviewed? How were the data collected? This page also describes why readers should: be skeptical when dealing with comparisons, and be aware of numbers taken out of context.

• ### Sample Sizes

This resource discusses sample sizes and how they are chosen.
• ### Dataset Example: Student's T

This resource explains the t-distribution and hypothesis testing (informally) using an example on laptop quality.
• ### Quote: Gibbon on Probability

This day may possibly be my last: but the laws of probability, so true in general, so fallacious in particular, still allow about fifteen years. A quote of English historian Edward Gibbon (1737 - 1794). The quote was written in 1787 and was published after his death in "Miscellaneous works of Edward Gibbon, with memoirs of his life and writings composed by himself" edited by Lord John Seffield, 1796