If I were to design an experiment to see if students in their 20s can run the mile faster than faculty in their 30s, 40s, 50s, and 60s. How hot it is the moment of the test would be an ___________ variable. If, in the above experiment, only one person were able to run on the track at a time, which strategy would be recommended to minimize the impact of any changing extraneous variables throughout the day?

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