we do a pretrial with 20 users, the upper limit for the standard deviation is 14.61,
and the number of users required for the main trial is 25.
It is difficult to make a better case for the cost-effectiveness of standardized
metrics.
Incidentally, in relation to the time-honored probability values of 0.05 and
0.01 (and the 95% confidence interval) it should be pointed out that these have
no actual weight other than that they are generally accepted within the behav-
ioral scientific literature as standards. In an applied setting, although one should
use the 0.05 probability value as a guide (do you really want to endorse findings
that may turn out differently ...
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