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 11 with variance 25 and an IRS from B of size 6 with variance 36. What is the CRITICAL VALUE for a 95 percent confidence interval for the difference of population means if we assume both populations have the same population variance? O 2.145 2.131 2.120 NONE OF THE OTHERS 2.110

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