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To construct a confidence interval for the difference between two population means I - 2, use the formula shown below when both population standard deviations

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To construct a confidence interval for the difference between two population means I - 2, use the formula shown below when both population standard deviations are known, and either both populations are normally distributed or both n, 2 30 and no 2 30. Also, the samples must be randomly selected and independent. (* 1 -*2) - Zo n2

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