If the correlation coefficient between x and y is 0.5 and the regression coefficient of y on x is 0.5, then the regression coefficient of x on y is: 

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SSC CGL Tier-II (JSO) 2022 Official Paper (Held On: 4 March 2023)
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  1. 0.05
  2. 0.5
  3. 1
  4. 0.25

Answer (Detailed Solution Below)

Option 2 : 0.5
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The correct answer is 0.5
Key Points Given, 
the correlation coefficient between x and y (rxy) = 0.5 
the regression coefficient of y on x (byx) = 0.5 
Then, the regression coefficient of x on y (bxy) = \({r^2 \over b_{yx}}\) = \({(0.5)^2 \over 0.5} = 0.5\)
Important Points

The correlation coefficient between x and y (rxy) = \(\sqrt {{b_{xy}} × {b_{yx}}}\)
or, rxy2 = bxy × byx
or, bxy = \({r^2 \over b_{yx}}\)
Hence, the required value of the regression coefficient of x on y is 0.5

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