# Introducing sampling - JenniferIngram

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```					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

 How will you collect the data?

 Make a graph?
 Take a sample…
Sample

 Why is a sample better than using the whole
population?
 Practicable
 Takes less time

 How might we sample?
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?
In pairs – go sample…

 Take a sample of 30 girls and a sample of 30
 Graph your data on the graphs provided
 Write at least three I notice statements about
Share…

 Leave your graph and I notice statements on
 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
Conclusion

 Did the graphs of different samples give the
same information?
 In what ways were they the same?
 In what ways were they different?
I notice…

 Statements from my data
I wonder…

 Inferential statements about what is
happening back in the population

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