Bivariate Data

1
Bivariate Data

• The statistics we have considered so far have
  involved 1 variable. In each case quantities
  varied depending on a particular group.
• Eg. Family Size Vs. year, Population Vs.
  Australian State
• Bivariate data deals with two variable groups
  that are not necessarily related.
• We can analyse Bivariate data to establish
  whether there is a relationship, i.e. whether
  there is a correlation between the data.
• Eg. Footsize Vs. IQ, Engine Capacity Vs Fuel
  Consumption, Smoking Vs. Incidents of Cancer,
• We do this using a scatter graph.

2
Scatter Graphs
If a scatter graph shows a correlation, the
correlation will be