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If two random samples of sizes n1 and n2 are selected independently from two populations with means m1 and m2, then the mean of x1

If two random samples of sizes n1 and n2 are selected independently from two populations with means m1 and m2, then the mean of x1 - x2 equals __________________.

A. m1 + m2

B. m1 - m2

C. m1 / m2

D. m1m2

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