The following table summarizes red blood cell mass (milliliters) of two groups of male rats. A Group "A" consisting of 16 rats, were tested after a spacelab test trip. Group "B" rats were a control group.
Group A
n=16
x bar= 7.88
std. dev. 1.017
Group B
n=18
x bar= 8.43
std. dev=1.005
Test the claim that the spacelab rats (Group A) have a different red blood cell mass than the control group
Use a 0.05 level of significance