Consider the two statements. \(S_1 :\) There exist random variables \(X\) and…

GATE · 2021 · CS · Set 1 · Computer Science & IT

Consider the two statements. 

S1:S_1 : There exist random variables XX and YY such that

(E[(X−E(X))(Y−E(Y))])2>Var[X]Var[Y]\left(\mathbb E[(X-\mathbb E(X))(Y-\mathbb E(Y))]\right)^2>\textsf{Var}[X]\textsf{Var}[Y]

S2:S_2 : For all random variables XX and YY,

Y,Cov[X,Y]=E[∣X−E[X]∣  ∣Y−E[Y]∣]Y, \textsf{Cov}[X,Y]=\mathbb E \left[|X-\mathbb E[X]|\;|Y-\mathbb E[Y]|\right ]

Which one of the following choices is correct?

  1. A.

    Both S1S_1 and S2S_2 are true.

  2. B.

    S1S_1 is true, but S2S_2 is false.

  3. C.

    S1S_1 is false, but S2S_2 is true.

  4. D.

    Both S1S_1 and S2S_2 are false.

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