Does $|\mathsf{E}(xy)|\leq |\mathsf{E}(x)| \cdot |\mathsf{E}(y)|$ hold for any random variable $x$, $y$? Here $\mathsf{E}$ is the expectation.
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Does $|\mathsf{E}(xy)|\leq |\mathsf{E}(x)| \cdot |\mathsf{E}(y)|$ hold for any random variable $x$, $y$? Here $\mathsf{E}$ is the expectation.