The general idea behind two-sample tests is to create a test statistic that represents:
a.The square of the average of the variations within the two individual groups.
b.The variation within the individual groups minus the variation between the two groups.
c.The variation within the individual groups divided by the variation between the groups.
d.The variation between the two groups minus the variation within the individual groups.
e.The variation between the two groups divided by the variation within the individual groups.
f.The square root of the variation between the two groups.