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.

Evaluate the strengths and limitations of using a scatter graph.

Strengths
Limitations

Strengths of Using Scatter Graphs –

  • Trends or correlations can be easily seen.
  • It is possible to use a line of best fit to make predictions about unobserved data.
  • Further calculations can be made from the result.

Weaknesses of Using Scatter Graphs –

  • Anomalies can make drawing the line of best fit difficult.