Two random samples are selected from two independent populations. A summary of the samples sizes and sample means is given below: n1 = 51, = 53.2 n2 = 50, I2 = 77.3 If the 97% confidence interval for...

Extracted text: Two random samples are selected from two independent populations. A summary of the samples sizes and sample means is given below: n1 = 51, = 53.2 n2 = 50, I2 = 77.3 If the 97% confidence interval for the difference u lz 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 =