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

Product Moment Correlation Coefficient

Powerpoint PMCC

Worksheet PMCC (to use with the above Powerpoint)

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