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Cost-Justifying Usability, 2nd Edition
book

Cost-Justifying Usability, 2nd Edition

by Randolph G. Bias, Deborah J. Mayhew
May 2005
Beginner to intermediate
640 pages
23h 47m
English
Morgan Kaufmann
Content preview from Cost-Justifying Usability, 2nd Edition
because we are continually revising our statistic, it is important in this case to
guard against the cardinal statistical sin of capitalizing on chance. Thus the ES
needed for the statistic to be significant will be extremely large when the sample
sizes are small. However, as the sample sizes get bigger, the rejection regions are
“protected,” so that if a hypothesis is rejected with a certain sample size, you may
be confident that had the tests continued, it would also have been rejected with
samples sizes larger than the one stopped at. In this case, sequential testing puts
the evaluator at a significant disadvantage with respect to the required sample ...
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Publisher Resources

ISBN: 9780120958115