S1 Correlation and Regression

Part of S1

Objectives

• Scatter diagrams
• Linear regression
• Drawing regression line on a scatter diagram
• Explanatory (independent) and response (dependent) variables
• Applications and interpretations
• Make predictions within the range of values of the explanatory variable and recognise the dangers of extrapolation
• Variables other than x and y may be used
• Linear change of variable may be required
• The product moment correlation coefficient, its use, interpretation and limitations

Supporting activities

Worksheet PMCC

[Media:Correlation_and_pmcc.ppt Powerpoint PMCC]

Notes

Spec says "Calculation of the equation of a linear regression line using least squares" which we assume is a reference to understanding the component parts of the PMCC formula and being able to find them for small sets of data