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What are extraneous and confounding variables

Response to the following problem:

What are extraneous and confounding variables? Which type of variable is most dangerous to the statistical conclusion validity and the internal validity of experimental research, and why?

Support your work by citing sources according to APA standards.

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## Q : Compute the random variables with probabilities

Show that I(X; Y ) = 0, with equality if and only if X and Y are statistically independent.