jaysung;229757 Wrote: > <snip> > By saying that I reached signifficant recognition rates of .0531% I > mean that there is only 1024*0.0531 56 approx. (had calculated with 55) > possibilities of have 8 out of 10.
Hi Jay, thanks for the explanation. I teach physics and am also pretty familiar with probability and statistics. I was asking about sequence to make sure you hadn't thrown away some initial series of not-so-successful trials. People often do that, thinking they need to "warm up", but it can be extremely misleading because you may (perhaps not consciously) throw away results until you achieve something consistent with your expectations. That's sometimes called cherrypicking, and it's a big concern in science (it's one of the reasons you should never fully trust the reported statistical significance of experiments). Do I understand you correctly that you identified the source correctly 8 times out of 10 trials? The chance of scoring 8 or higher out of 10 randomly is 5.5%. However in this instance one should double this, because the null hypothesis (that the two sources are identical) would be rejected either by a very high score or a very low one (in other words you should use the "two tailed" distribution). 8/10 or better OR 2/10 or worse will occur randomly 11% of the time, which doesn't meet the criterion of stat significance. That's especially important here, where the test was single blind (your girlfriend and you were in the same room, right?). -- opaqueice ------------------------------------------------------------------------ opaqueice's Profile: http://forums.slimdevices.com/member.php?userid=4234 View this thread: http://forums.slimdevices.com/showthread.php?t=38653 _______________________________________________ audiophiles mailing list [email protected] http://lists.slimdevices.com/lists/listinfo/audiophiles
