1. © Nuffield Foundation 2012 Nuffield Mathematics Activity DISCUSS regression and correlation CC Rudolf Stricker

2. © Nuffield Foundation 2010 DISCUSS regression and correlation Height 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?

3. Use the following online tutorial to learn about regression and correlation: DISCUSS regression and correlation http://www.icse.xyz/discuss/regression/

4. Reflect on your work Explain 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.