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The following information was obtained from two independent samples selected from two normally distributed populations with unknown but equal standard deviations.

a. Let 1 be the mean of population 1 and 2 be the mean of population 2. What is the point estimate of µ1 €“ µ2?

b. Construct a 98% confidence interval for µ1 €“ µ2.

c. Test at a 1% significance level if µ1 is greater than µ2.

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