Suppose that an urn contains 15 red balls and 10 blue balls, and suppose that eight balls are to be selected at random from the urn with replacement. Let X denote the number of red balls that are selected. Find the expectation and variance of X.

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Q: If you have samples of n₁ = 22 and n₂ = 19, in performing the pooled-variance t test, how many…

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