Mike Anderson Wrote:
> I'd really like to know who started this "rule of thumb", because it's
> wrong.
>
> If you can tell the difference between A and B 100% of the time, you'd
> only need 5 trials to get statistical signifance beyond the 0.05 level.
> This is because the calculation of an exact p-value under the usual
> null hypothesis is simply 0.5^5 = 0.03125, which is less than 0.05.
>
> On the other hand, if the difference between A and B is so slight that
> you can only tell the difference 51% of the time, then you're going to
> have to do a lot more than 16 trials to detect that difference.
Right on! I was assuming the difference wasn't that obvious. I'll grant
that I haven't offered any proof that you can't hear a difference. I
just know from my own experience, even listening to FLACS vs 128 kbs
mp3's (and even knowing which is playing), I can't tell the difference
on my system. Then again, I'm color-blind, too. Well, maybe I'll just
consider myself lucky that I can't hear these "subtle" differences.
Otherwise, I might be in the poor house with all you "tweako/weirdos",
as Peter Aczel ("The Audio Critic") calls 'em.
--
ezkcdude
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