Why is it important to know about any differences in two groups being compared, in addition to the factor of interest?
A)If the groups are too different, it becomes difficult to see the effects that are due only to the factor of interest.
B)If the groups are too similar, then any difference found in the factor must be simply due to chance.
C)Unless there is a big difference in the results, it doesn't matter whether or not the groups themselves are different.
D)None of the above.

Question

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It is important to know about any differences in two groups being compared because if the groups are too different, it becomes difficult to see the effects that are due only to the factor of interest.

Why Is It Important to Know About Any Differences in Two