Identifying and clarifying the population
What is a sample?
Do boys at Karekare College tend to have
longer popliteal lengths than girls at Karekare
How will you collect the data?
Make a graph?
Take a sample…
Why is a sample better than using the whole
Takes less time
How might we sample?
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
What do you think your graphs will look like?
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
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
Did the graphs of different samples give the
In what ways were they the same?
In what ways were they different?
Statements from my data
Inferential statements about what is
happening back in the population