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Module 1: Regression line

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Finding the equation of a regression line

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XSIQ
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Core Mathematics - Finding the equation of a regression line

Finding the equation of a regression line

Steps to finding the line of best fit by eye.

1) Construct a scatterplot of the data.

2) Locate the point defined by the medians of the data sets.

3) Place a ruler on the scatterplot and adjust it until it runs through
the centre of the data.

4) Draw in the line.

5) Calculate the gradient and the Y-intercept of the line.

6) Determine the equation using the general rule.

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