Question

the values calculated for 15 pairs of x and y variables are:

=
2/3

, r =
1/2


, s.d of x=3, then s.d of y is​

Answer 1

Step-by-step explanation:

We know that

r × sdx × sdy = cov( x,y )

Hence,

r × 40 × 16 = 256

r × 20 × 8 = 256

160r= 256

160/256=r

0.625 = r

Answer 2

Inorder to find value of s.d of y we will use the formula given below

Cov( x, y ) = r * sdx * sdy

Hence,

r * 40 * 16 = 256

r * 20 * 8 = 256

160 r= 256

r =$\frac{256}{160}$

0.625 = r