"Scott Gardner" wrote in message
...
Does anyone know the general equation that tells you how many trials a
subject must complete successfully to achieve a desired certainty that
the results weren't from guessing?

In other words, for "N" trials, what number "M" of them must the
subject complete successfully to be "X" percent sure the results
weren't from guessing?

Thanks,
Scott Gardner

Not quite that simple.

Here is a good discussion.

http://www.music.miami.edu/programs/...ya/chapter_5/c
hapter_5.htm

ScottW