Question

If regression line of Y on X is y=35+2x, cov(x,y)=50. Find the standard deviation of X​

Answer 1

Answer:

Rewriting the equations (i) and (ii), we have

From equation (i)

y=2−x+25

y=−0.5x+2.5 *regression line of y on x)

byx=rσxσy=−0.5....(iii)

From eqution (ii),

x=2−3y+28

x=−1.5y+4( regression line of x on y)

bxy=rσyσx

∴r2=byx×bxy=(−0.5)×(−1.5)=0.75

∴ r=0.75<

Answer 2

Step-by-step explanation:

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