Assumptions Underlying the Tests
Assumptions Underlying the Pearson Correlation Coefficient
Interval-level measurement. Both the predictor and criterion variables should be assessed on an interval- or ratio-level of measurement.
Random sampling. Each participant in the file will contribute one score on the predictor variable, and one score on the criterion variable. These pairs of scores should represent a random sample drawn from the population of interest.
Linearity. The relationship between the criterion and predictor variables should be linear. This means that the mean criterion scores at each value of the predictor variable should fall on a straight line. The Pearson correlation coefficient is not appropriate for assessing the strength of ...
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