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Suppose you want to test the equality of the means of two populations with standard deviations 0,=02=4. Two random samples of sizes n=n2=50 are selected

Suppose you want to test the equality of the means of two populations with standard deviations 0,=02=4. Two random samples of sizes n=n2=50 are selected and give means of X1 = 28 and x = 24, the test statistic z.=

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