Compared to the Pearson r, the Spearman r is a
A) more powerful test
B) less powerful test
C) test of equal power
D) none of these, since power cannot be established for the r

Question

Quizplus · Accepted Answer

The Spearman rank correlation coefficient is a non-parametric test that does not assume normal distribution of the data. However, unlike Pearson correlation which measures linear relationships, Spearman correlation measures the monotonic relationship (i.e., whether the relationship between two variables is consistently increasing or decreasing). The Spearman correlation is less powerful than the Pearson correlation because it reduces the data to ranks and ignores the actual numerical values. However, it can still be a useful tool when the relationship between two variables is non-linear or when the data is not normally distributed.

Compared to the Pearson R, the Spearman R Is a