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66.51.146.3
In Reply to: RE: statistics question posted by mike1127 on June 25, 2009 at 11:17:03
If one wire is louder than the other,
or one wire picks up hum from a nearby wire,
and the other doesn't,
or one wire has corroded terminations,
and the other wire doesn't,
then no expertise in statistics
will create a good test design.
Make sure the terminations are clean and tight.
Make sure SPL's at 1000Hz. are the same using a mike on a tripod
A perfect test design would require ONE trial.
Golden Ears think ONE sighted audition followed by endless pontification about the wires, is a perfect test design!
With imperfect test designs, 12 correct of 16 trials reduces the probability of lucky guessing to 3.8%.
A typical test has 100 A-B-X comparisons within the 16 trials, and lasts a few hours.
Make sure you think you can hear a difference under sighted conditions BEFORE you switch to blind conditions.
No winking or hand signals or smiling when the "good" wires are connected by the test "leader"
Each trial can last 10 minutes or 20 minutes or an hour or a whole day
(Please see link for more details on the statistics)
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Richard BassNut Greene.....................................................................
The "Cliff Claven" of Audio
and the "Floyd R. Turbo of Bingham Farms Michigan"
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