Question 21 of 50 1 Points A correlation matrix of the relations among four variables appears below. What is the numerical value of the missing correlation (a) ? (Ignore the XX parts). X1 X2 X3 X4 X1 XX -0.14 0.62 0.22 X2 -0.14 XX 0.58 0.32 X3 0.62 a XX -0.9 X4 0.22 0.32 -0.9 XX O A. -0.9 O B. 0.32 C. 0.62 O D. 0.58 E. None of the above. Reset Selection Mark for Review What's This? 8 3