Solve it please. -26
40 x 20
-26
-26
800 - 28.28
= - 0.92
Coefficient of Correlation (r) = — 0 99
I USTRATION 3.
rom the data given below, find the number of items (N):
r = 0.5, Exy = 120, Standard Deviation of Y (o )= 8, Ex2
= 90
where, x and y are deviations from arithmetic mean.
SOLUTION :
Given: r = 0.5, Exy = 120, Ex2 = 90, o = 8
Ey2
Now,
when y = Y —Y [Formula of standard deviation]
Ey2
8
