I need help with this question please! Thank you!

SoccerBoss
Category:
Statistics
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Question description

In two separate studies, the actual difference between the means of a treated group and untreated group is 3 points.  However, in one study, the σ M1-M2 is very large and so the 3 points is not found to be significant.  In the other study, the σ M1-M2 is very small and so the 3 points is found to be significant.  What might have caused this big difference in the σ M1-M2 for the two studies?

 

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