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Derek, a high school football coach, decides to use the time taken to run up 100 stairs as a test for running endurance. he tests every team member on three consecutive days and finds that the time taken by each person is very much the same on all three trials. his test for endurance appears to have high levels of _____.

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The correct answer is reliability.

Reliability refers to the extent to which a measure or test consistently produces the same results over time and different occasions. Since Derek's endurance tests produces the same result (time taken by each runner) consistently over three days, his test is high in reliability. Reliability adds credibility to tests and measures. 

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