Data can support a claim — Data, 7–10 years
A claim is something someone says about what the data show. Good data can support a claim, weaken it or leave the answer uncertain. The important habit is to ask whether the evidence really matches the strength of the statement.
A claim needs a reason
If someone says, More people chose the blue team, that is a claim. The recorded choices are the evidence. We can check the evidence instead of simply trusting the sentence: perhaps blue has 12 votes and red has 9, or perhaps the numbers were read incorrectly.
Why check the evidence?
People naturally notice data that fit a story and overlook data that do not. Checking the evidence helps us avoid decisions based on a tiny part of the picture. It also makes our words fairer: a small difference may support saying slightly more, but not saying something is always true.
Testing a claim
Claim: Children read more on rainy days. A library counts books borrowed on two rainy days: 18 and 20, and two sunny days: 17 and 19. The rainy total is 38 and the sunny total is 36, so these records support a small difference. They do not prove that every rainy day has more borrowing.
The always trap
A few matching results can make a strong rule feel obvious. If three mornings are colder than three afternoons, it is tempting to say mornings are always colder. That is a reasonable shortcut because patterns help us predict, but real data may have exceptions. Say what the records support, no more.
Data behind everyday claims
Advertisements, sports reports and news stories often make claims using numbers. You can ask: What was counted? How many cases were included? Is the statement stronger than the data allow? This does not mean doubting everything; it means matching confidence to the evidence.
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