If bxy is positive then byx is
Positive
Negative
Can be any
None of these.
The coefficient of correlation is independent of
Change of origin only
Change of scale only
Change of origin and scale
If cov(x,y)= -1.55, var (x) = 1.55, var (y)= 1.55, then ρ(x,y) =
1
-1
0
The lines of regression of a set of data are 8x-10y+66 = 0, 40 x -18y = 214. The variance of x is 9. Then the mean value of x and y are
15,16
13,17
14,16
15,17
The regression coefficients are -0.8 and -0.8. The coefficient of correlation is
0.64
0.8
-0.8
If x and y are independent then cov (x,y)= ___________
0.5
The limits of spearman's rank correlation (R) coefficient is
-∞<R<∞
0 ≤ R<∞
-1≤R≤0
-1≤R≤1
If the regression lines are identical, the correlation coefficient is
+1
Either +1 0r -1
If the two regression lines are x+4y=3 and 3x+y =15, then the value of x for which y = 5 is
3/10
-17
10/3
1/17
The coefficient of correlation between x and y is 0.6. Their covariance is 4.8 and var(x)=9 . Then σy =
8/3
3/8
8/9
9/8