Experiment 25

Within-subjects t-test
Wilcoxon matched-pairs signed-ranks test
Applied Psychology

Misunderstandings between pilots and air-traffic controllers are counted in a field study. Each shift worked by a controller is divided into two equal parts and the mean number of misunderstandings per hour in each part computed for each controller over a 1 month period. It is expected that more misunderstandings will occur in the later part of the shift because the controller is tired.

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