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Is the following an or an , and why? experiment observational study A medical researcher wants to know if people who own a treadmill are
Is the following an or an , and why? experiment observational study A medical researcher wants to know if people who own a treadmill are less likely to have tested positive for Covid at any time in their life. (Maybe they are more healthy than average.) He hires a skilled pollster who is able to get many people to answer truthfully whether they have a treadmill and whether they have ever tested positive for Covid
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