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to MetroMPG: I've read and re-read your post which starts this thread. I have no training in statistics, and although I can do the "A-B-A" testing, I don't know how to tell whether differences are significant. Can you describe "statistical significance" in layman's terms? For instance, if I do 5 two-way "A" runs with an average of 59.8 MPG, and standard deviation of 1.4, then 5 "B" runs of 60.6 MPG and s.d. of 1.4, does this mean anything?
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