DISCUSS regression and correlation

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DISCUSS regression and correlation Nuffield Free-Standing Mathematics Activity DISCUSS regression and correlation CC Rudolf Stricker

DISCUSS regression and correlation Height Age of plant Plant heights How does the height of a plant depend on its age? 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.

DISCUSS regression and correlation Use the following online tutorial to learn about regression and correlation: http://www.mis.coventry.ac.uk/~nhunt/regress/index.html The student sheets tell you which parts to do and which to leave out.

DISCUSS regression and correlation Reflect on your work Explain what is meant by ‘regression’ and ‘correlation’. What is the difference between interpolation and extrapolation? 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.