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Statistical significance vs Practical significance

when N is large, even a trivial difference (small effect) may be large enough to produce a statistically significant result

eg menu choice: mean selection time of menu a is 3      seconds;                                     menu b is  3.05 seconds

Statistical significance does not imply that the difference is important!

a matter of interpretation, i.e., subjective opinion

should always report means to help others make their opinion

There are measures for effect size, regrettably they are not widely used in HCI research

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