Biology, 31.01.2020 02:50 hsjsjsjdjjd

The essential difference between an experiment and an observational study is that a. observational studies always involve large numbers of subjects, but experiments never dob. in an experiment, information is gathered only on animals or things, but in an observational study, only information about people is gatheredc. an experiment imposes treatment on the subjects, but an experiment does not
d. an observational study imposes treatments on the subjects, but an observational study does not

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The essential difference between an experiment and an observational study is that a. observational s...