© Nuffield Foundation 2012

Nuffield Mathematics Activity

DISCUSS regression and correlation

CC Rudolf Stricker

© Nuffield Foundation 2010

DISCUSS regression and correlationHeight

Age of plant

Plant heights

How does the value of a car depend on its age? Price

Age of car

Depreciation in value of cars

This activity is about finding relationships between variables and measuring their strength.

How does the height of a plant depend on its age?

Use the following online tutorial to learn about regression and correlation:

DISCUSS regression and correlation

http://www.icse.xyz/discuss/regression/

Reflect on your workExplain what is meant by ‘regression’ and ‘correlation’.

What is the difference between interpolation and extrapolation?

DISCUSS regression and correlation

If you find that r = 1, what can you say about the relationship between the variables?What if r = –1?What might a value of r near to zero indicate?

Correlation does not imply causation. Explain what this means. Suggest a real-life example.