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1 1 What is pooled variance? a. Since the two variances are essentially equal, we can select either for use in our calculation. b. It's the weighted average of the variances obtained from our samples. c. It's the summation of the variances obtained from our samples, divided by 2. d. It's the sum of the squared deviations between our estimated value of y and the actual value of y. e' S = (m-1)Sz+(n1)s2 m+n2