As part of a study on exercising, Liam has to use a treadmill for 20 minutes each

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As part of a study on exercising, Liam has to use a treadmill for 20 minutes each day, and then take and record his heart rate and blood pressure. Liam skips days, sometimes doesn’t do the entire 20 minutes, and sometimes forgets to record his heart rate and blood pressure. Is this an example of under coverage or nonresponse? Explain.

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