Two random samples are selected from two independent populations. A summary of the samples sizes and sample means is given below: n1 = 51, T = 53.2 n2 = 50, 2 = 77.3 If the 97% confidence interval for the difference u l2 of the means is (-27.678, -20.522), what is the value of the pooled variance estimator? (You may assume equal population variances.) Pooled Variance Estimator =

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