Assuming that both populations are normally? distributed, construct a 95?% confidence interval about μ1-μ2. ?(μ1 represents the mean of the experimental group and μ2 represents the mean of the control? group.)
Experimental Control
n 25 22
minus over x 45.1 43.8
s 4.5 9.1
The confidence interval has a lower bound of __?__and an upper bound of __?___.