Question: Help with question 9 To construct a confidence interval for the difference between two population means , - 2, use the formula shown below when

Help with question 9

To construct a confidence interval for the difference between two population means , - 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 ny 2 30. Also, the samples must be randomly selected and independent (*1 -*2) -20 n2

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