Suppose a researcher generates a correlation matrix for four variables. How many correlation coefficients would be in the matrix?
A) 9
B) 6
C) 4
D) 10

Question

Quizplus · Accepted Answer

A correlation matrix for four variables includes the correlation of each variable with every other variable, but not with itself, and since correlations are symmetrical (the correlation between A and B is the same as between B and A), we only count each pair once. This results in 6 unique correlations: AB, AC, AD, BC, BD, CD.

Suppose a Researcher Generates a Correlation Matrix for Four Variables