7. Worker Fatigue To study ways to reduce fatigue among employees whose jobs involve a monotonous assembly procedure, 12 randomly selected employees were asked to perform their usual job under each of three trial conditions. As a measure of fatigue, the experimenter used the number of assembly line stoppages during a 4-hour period for each trial condition.

a. What type of experimental design has been used in this experiment?

b. Use the Friedman Fr-test to determine whether the distribution of assembly line stoppages (and consequently worker fatigue) differs for these three conditions.
Test at the 5% level of significance.

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