The Pearson product-moment correlation requires that the data be measured on at least a ____ scale.
A)nominal
B)interval
C)ordinal
D)non-numeric

Question

Quizplus · Accepted Answer

The Pearson product-moment correlation coefficient is used to measure the strength of the linear relationship between two quantitative variables that are measured on an interval or ratio scale. It assumes that the variables are normally distributed and that there is a linear relationship between them. Therefore, the data must be measured on at least an interval scale. Nominal and ordinal data do not satisfy this condition as they are not quantitative and do not have a numerical order. Non-numeric data also do not satisfy the condition as they are not numbers.

The Pearson Product-Moment Correlation Requires That the Data Be Measured