defence exam Agniveer Vayu Group X & XY Mock Test 01/2026 Mathematics Statistics Correlation and Regression
For three random variables X1 , X2 and X3, the pairwise correlation coefficients are r12 = r13 = r23 = r. The multiple correlation coefficient \(\rm R_{1.2.3}^2\) is
1
\(\rm \frac{2r}{1+r}\)
2
\(\rm \frac{r}{1+r}\)
3
\(\rm \frac{2r^2}{1-r}\)
4
\(\rm \frac{2r^2}{1+r}\)