Science & Math

Statistics for Reading the News

Read any headline number, poll or study result and judge in minutes how much of it you should believe.

This course is for members

$9 unlocks every course in the library, this one included, plus a credit to build a topic of your own and at least 10 new courses every month.

Join for $9Sign in

What you will learn about Statistics for Reading the News

The 7-day sprint
  1. Every Headline Number Is an Estimate. Most numbers in the news come from a sample rather than a full count, so each one carries a range of uncertainty that the headline almost never shows.
  2. Why Good Numbers Change Later. Revisions are estimates being updated as more information arrives, not proof that the first number was a lie.
  3. What a Margin of Error Really Covers. Margin of sampling error is expressed in percentage points at a stated confidence level, it applies only to probability based samples, and it covers just one of the many ways a poll can be wrong.
  4. Who Never Answered, and How the Gap Was Patched. Modern poll error comes mostly from who is missing and how the pollster adjusts for them, not from the arithmetic of sample size.
  5. Relative Risk, Absolute Risk and Base Rates. A percentage change in risk tells you nothing until you know the risk you started from.
  6. Significant Does Not Mean Important. A p-value measures how incompatible the data are with a specified statistical model, not whether a finding is true, large or worth acting on.
  7. Judge the Producer, Then Run the Checklist. Trust in a number depends on the transparency and systems of whoever produced it, and both official statistics and polling have published standards you can hold them to.
The 80/20: the 7 concepts that matter most
  • The number has a range, and the range often includes no change
  • Margin of sampling error is narrow in scope and written in points
  • Who is missing beats how many answered
  • Relative change without a base rate is theater
  • Statistical significance is not truth, size or importance
  • First prints get revised, and that is the system working
  • Judge the producer's transparency when you cannot judge the method
The core idea, explained like you are 5

A number in the news is almost always a measurement taken from a small piece of the world, so it comes with a range around it, and reading it well means asking how that piece was chosen and how wide the range is.

Then the quiz and the ladder

10 questions that correct you when you are wrong, and beginner, intermediate, advanced levels, each with a practical exercise.

Created Sep 13, 2026. No mistakes have been reported by learners.

Written from these sources