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Introducing sampling

Lesson 3. Introducing sampling. Focus . Identifying and clarifying the population Sampling variation What is a sample? Why sample?. Karekare College. PROBLEM. Do boys at Karekare College tend to have longer popliteal lengths than girls at Karekare college?. DATA.

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Introducing sampling

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  1. Lesson 3 Introducing sampling

  2. Focus • Identifying and clarifying the population • Sampling variation • What is a sample? • Why sample?

  3. Karekare College

  4. PROBLEM • Do boys at Karekare College tend to have longer popliteal lengths than girls at Karekare college?

  5. DATA • How will you collect the data? • Make a graph? • Take a sample…

  6. Sample • Why is a sample better than using the whole population? • Practicable • Takes less time • How might we sample?

  7. Sample  Population • Can a sample tell us about the population? • Sample is good enough to look at the population • We can get general/overall ideas, not specifics • We take a sample because it tells us about the population • What do you think your graphs will look like?

  8. In pairs – go sample… • Take a sample of 30 girls and a sample of 30 boys from your population • Graph your data on the graphs provided • Write at least three I notice statements about your sample

  9. Share… • Leave your graph and I notice statements on your desk… • Go and look at other graphs. • For each other graph observe (and write) • One thing that is similar to your graph and • One thing that is different from your graph

  10. Conclusion • Did the graphs of different samples give the same information? • In what ways were they the same? • In what ways were they different?

  11. I notice… • Statements from my data

  12. I wonder… • Inferential statements about what is happening back in the population

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