Two random samples are selected from two independent populations. A summary of the samples sizes and sample means is given below: n1 = 51, ī1 = 53.2 n2 = 50, ī2 = 77.3 If the 97% confidence interval...

The answer is not 8.2845704 or 1.6488

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, ī1 = 53.2 n2 = 50, ī2 = 77.3 If the 97% confidence interval for the difference u1 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 =