I think its A A scientist selects 400 people who snore at night to test how many hours they actually snore. The average length of time is, surprisingly, only 4.2 hours. What kind of study is this? Sample

I think its A

A scientist selects 400 people who snore at night to test how many hours they actually snore. The average length of time is, surprisingly, only 4.2 hours. What kind of study is this?

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Experimental study
Double-blind study
Observational study

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I think its A A scientist selects 400 people who snore at night to test how many hours they actually snore. The average length of time is, surprisingly, only 4.2 hours. What kin…

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