Two numerical variables
Learning outcomes
On watching this video, students should be able to:
- Identify when and why a scatterplot is useful.
- Interpret a scatter plot making note of the direction (positive or negative), form (linear or non-linear) and strength of the relationship, as well as any unusual observations that stand out.
- Identify situations when the dimensionality of a scatter plot can be extended through use of colour and size of markers.
- Explain what a correlation coefficient (r) measures, and it's appropriate to use.
- Interpret a correlation coefficient and relate it to a scatter plot.