Figure 1 Which label describes which scattergram?
Correlation is a statistical measure of the association between variables. Correlation requires two or more variables that can be measured mathematically. The variables must be represented in a continuous form, i.e. the data are numerical and have a sequence.
Two variables correlate positively if, as one increases, so does the other. For example, some research has found a modest positive correlation between IQ and head size. This means that the larger your head the greater the probability of you having a high IQ.
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