Idea 15of 22Builds onAsk everyone the same way
Two fair samples can differ a little
Do two fair samples always give the same answer?
Today you'll discover
- what a second fair draw says
- a small difference against a big one
- when to suspect a sample
Think firstSam's draw said 3 of 10
Nadia also draws 10 names from the hat. Will she get exactly 3 of 10?
Decide first, then press Next. Compare the top bar from one state to the next.
The same 60 students. Sam's 10 from the hat say 3 of 10 want a court. Nadia's 10, different students, are ringed; they say 4 of 10. Both are close to the school's 18 of 60. Then Maya's 10 at the court: 8 of 10, far from the school.
See the whole ideathe big idea and the key word, in one place
The big idea
Two fair samples can differ a little; that variation is normal, not a mistake.
Compare themSmall difference: Sam 3 of 10, Nadia 4 of 10, both fair. Big difference: Maya 8 of 10, from a sample that shut 48 out.
Easy to get wrongDon't call every difference unfair. First ask whether everyone had a chance to be picked.
Key word
- variation
- the small differences between fair samples, because different people were picked
Ready to use it?
- Tell normal variation from a sample that shut people out.