Two random samples are selected from two independent populations. A summary of the samples sizes and sample means is given below:   ?1=45,?2=50,?¯1=57.4?¯2=73n1=45,x¯1=57.4n2=50,x¯2=73   If the 92.5% confidence interval for the difference ?1−?2μ1−μ2 of the means is (-18.6761, -12.5239), what is the value of the pooled variance estimator? (You may assume equal population variances.) Pooled Variance Estimator =

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