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Suppose that we have disjoint normal populations A and B and we want to find the standard error estimate for estimating the difference in their

Suppose that we have disjoint normal populations A and B and we want to find the standard error estimate for estimating the difference in their means.We have an IRS from A of size 8 with variance 25 and an IRS from B of size 9 with variance 16.What is the CRITICAL VALUE for the 99 percent confidence interval for the difference of population means if we assume both populations have the same population variance?

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