jaysung;229995 Wrote: > > For the ten categories I ended up with > Right trials: > 0 1 2 3 4 5 6 7 8 9 10 > 1 10 45 120 210 252 210 120 45 10 1 = 1024 total events > That means that there are 56 paths where I get 8 out of 10 right? >
Correct, for a ratio of .055. > > Now why should I if I confuse the two sources completely i.e less than > 2 right trials assume that they are different? Because that would > indeed make two tailed distribution applicable. Well, in the this case the null hypothesis is that the two sources are indistinguishable. Now suppose you had scored 0/10. The chances of that happening if the NH is correct are quite small (1/1024), and therefore you would probably conclude that you could tell the difference and were simply mixed up about which was which. Since you'd also conclude you could tell the difference on a high score, both possibilities should be taken into account. At least that's the most conservative approach. > And why is the test single blind then? I heard two songs from sources > randomly choosen i.e first second second first first first second > second and then gave my judgement without seeing either the display of > the slim device or my Marantz amp. Single blind means you didn't know what you were hearing, but the experimenter did. In a DBT neither the subject nor the experimenter knows (until afterwards). Harder to arrange, but sometimes not much harder. -- 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
