The Pearson product-moment correlation coefficient, r, requires that variables be measured with _____________.
A)An interval or ratio scale.
B)An ordinal or ratio scale.
C)A nominal or ordinal scale.
D)A nominal or ratio scale.

Question

Quizplus · Accepted Answer

The Pearson product-moment correlation coefficient, r, requires that variables be measured with an interval or ratio scale in order to determine the strength and direction of the linear relationship between two variables. This is because the formula for r involves computing deviations from the means of the variables, which can only be done with interval or ratio data. Nominal and ordinal data do not have numerical values that can be used in this calculation.

The Pearson Product-Moment Correlation Coefficient, R, Requires That Variables Be