Watch the animation for constructing a scatter graph and then consider the question below.
Why use this technique? Is it appropriate?
Drawing a scatter graph and line of best fit shows us if there is a relationship or correlation between two sets of data.
Drawing a line of best fit also allows us to make predictions about unobserved data, i.e. data we haven’t collected. For example, we could use the line of best fit to predict what the discharge of the river would be when the channel width is 8 metres wide.