Answer (Choose 1 answer)
Two samples each of size 25 are taken from independent populations assumed to be normally distributed with equal variances. The first sample has a mean of 35.5 and a standard deviation of 5.0 while the second sample has a mean of 33.0 and a standard deviation of 6.0.The pooled variance is
A. 5.5
B. 25
C. None of the others
D. 12.5
E. 30.5
