uppose 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 9  and an IRS from B of size 4.  The POOLED variance is 18.72.  What is the MARGIN OF ERROR for the 99 percent confidence interval for the difference of populati

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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 means.  We have an IRS from A of size 9  and an IRS from B of size 4.  The POOLED variance is 18.72.  What is the MARGIN OF ERROR 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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