supremetylor29 supremetylor29

20-05-2019
Mathematics

contestada

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 survey
Experimental study
Double-blind study
Observational study

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daylward7 daylward7

20-05-2019

Experimental study they’re trying something out

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