PSYC 2002 Chapter Notes - Chapter 14: Pearson Product-Moment Correlation Coefficient, Scatter Plot, Level Of Measurement
26 Nov 2016
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Document Summary
Correlation is a statistical technique that is used to measure and describe the relationship between two variables. Usually the two variables are simply observed as they exist in the environment there is no attempt to control or manipulate the variables. A correlation requires two scores for each individual (one score for each of the two variables). These scores are normally identified as x and y. The pairs of scores can be listed in a table, or they can be presented graphically in a scatter plot. A correlation is a numerical value that describes and measures three characteristics of the relationship between x and y. The consistency of the relationship between x and y is measured by the numerical value of the correlation. A perfect correlation always is identified by a correlation of 1. 00 and indicates a perfectly consistent relationship. For a correlation of 1. 00 (or -1. 00), each change in x is accompanied by a perfectly predictable change in y.
