Statistics: Confidence Interval?

6. Independent random samples were drawn from two normal populations assumed to have the approximatelythe same standard deviation, resulting in the fo

6. Independent random samples were drawn from two normal populations assumed to have the approximately
the same standard deviation, resulting in the following summary statistics:
n1 = 25, s1 = 4.8, n2 = 16, s2 = 5.1
(a) Calculate a pooled estimate of the common standard deviation of the two populations.
(b) What is the margin of error for a 99% CI for the difference of the means?

or:6. Independent random samples were drawn from two normal populations assumed to have the approximatelythe same standard deviation, resulting in the following summary statistics:n1 = 25, s1 = 4.8, n2 = 16, s2 = 5.1(a) Calculate a pooled estimate of the common standard deviation of the two populations.(b) What is the margin of error for a 99% CI for the difference of the means?

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