Make sure instrument is reliable and provides range of responses. Differences in one variable relate to differences in the other. Correlations are presented as r or r squared. Typically, two scores are produced for each subject and are used to produce a scattergram. The closer to 1 the stronger the relationship between variables and more likely to be significant.
Weak correlations are coefficients near zero.
As one variable increases, the other decreases. No relationship between variables. As the explained variance increases, so too does the predictive ability. Classifying the Extent of a Relationship 1. Advantages of Correlational Research 1.