"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?

http://www.pcavtech.com/abx/abx_p9.htm

worked out table:

http://www.pcavtech.com/abx/abx_bino.htm