When interpreting scatter graphs, it is important to know that correlation does not indicate causation. Place an x at this point (5,1200).Ĭontinuing this method, we get the following scatter graph: To plot the coordinate for Car 1, we locate 5 on the horizontal axis (Age = 5 ), and then travel vertically along that line until we locate £1200 on the vertical axis (Selling price = £1200 ). Make sure you give your graph a suitable title. Plot each car as a cross on the graph one at a time. This will require drawing a break in the scale from the origin to 800. A sensible scale would be 800 to 2200 in steps of 100. This variable has the lowest value of 850 and highest value of 2200. The other axis will show the selling price of the car. A sensible scale would be 0 to 10 going up in unit steps.
This variable has the lowest value of 2 and highest of 10. Two pieces of data have been recorded for each car, age and selling price.Įach axis should have one of the variables and the scale should be appropriate for the given values. In this question the subjects are the ten cars. Identify that you have a set of bivariate data.īivariate data is a set of data which has two pieces of information for each subject.The table below shows the age and the selling price of each car.
