--- title: "Judging a Political Claim" description: "Manifestos, campaign figures and government statistics are all written to persuade. Checking one means finding the baseline, the denominator and the time window somebody chose." canonical: https://lightmysky.com/learn/civics-and-economics/judging-a-political-claim-mt_pGwJVkz8L1 source: https://lightmysky.com/learn/civics-and-economics/judging-a-political-claim-mt_pGwJVkz8L1.md retrieved: 2026-09-12 --- > **Agent view.** This is the Markdown twin of the page, for tools and assistants. > When to use this site, and the call that answers each job: https://lightmysky.com/agent-instructions.md > API description (OpenAPI 3.1): https://lightmysky.com/openapi.json · Authentication: https://lightmysky.com/auth.md > Pricing: https://lightmysky.com/pricing.md · Catalog: https://lightmysky.com/llms.txt · Full catalog: https://lightmysky.com/llms-full.txt > Every machine-readable file on this domain: https://lightmysky.com/.well-known/ai-catalog.json > Ask for Markdown with `Accept: text/markdown`, a `.md` address, or `?mode=agent`. # Judging a Political Claim Manifestos, campaign figures and government statistics are all written to persuade. Checking one means finding the baseline, the denominator and the time window somebody chose. Subject: Civics & Economics · Area: Government · Ages 16 to 18 Page: https://lightmysky.com/learn/civics-and-economics/judging-a-political-claim-mt_pGwJVkz8L1 ## Ready when they can - Take a political statistic and identify the baseline and the time window it depends on - Explain how the same policy can be reported as a cut and as an increase - Say what you would need to know before believing a costed promise ## Lesson: Read the number behind the number Numbers persuade you in a way opinions alone cannot. In 2008 a protester in Parliament Square argued against a war with a sign full of looked-up statistics, not just slogans. Campaigns and governments work the same way: when they want your belief, they reach for a number. That instinct is sound, because statistics are evidence. But a number is only as honest as the choices behind it. Someone picked which statistic to use, which starting point to measure from, and which stretch of time to cover. A claim can be technically true and still point you wrong if those choices flatter one side. Governments also pick their scoreboard: they brag about jobs and go quiet on prices, while the opposition does the reverse, both quoting real figures. **Example.** Polls hide the same choices in who was asked. A sample can stand in for millions if chosen fairly, and fail at any size if chosen badly. A convenience sample, like whoever passes one shopping centre, is cheap and often badly skewed. Polling eligible voters when only a smaller group will vote predicts wrongly too. So ask three things: who was asked, how were they found, and do they match the people in the claim. **Tip.** Finish every check at the source. Jobs and price figures come from a professional statistics agency, and its releases are public, so read those instead of the campaign summary. Even official numbers rest on definitions, like what counts as unemployed, which can be quietly swapped for a friendlier one. Ask where it came from, what it is compared against, and what was left out. **Recap.** Ask who was counted, from when, and what was left out, then check the source. ## Practice 8 questions on this page, each with its working shown. ## Needs first - [Public Policy and Public Problems](https://lightmysky.com/learn/civics-and-economics/public-policy-and-public-problems-mt_5vYuvjkprY) - [What a Feed Is Optimised For](https://lightmysky.com/learn/personal-and-social-development/what-a-feed-is-optimised-for-mt_kzhPakduam) - [Where International Rules Come From](https://lightmysky.com/learn/civics-and-economics/where-international-rules-come-from-mt_prBdcYuLoY)