Does each situation describe a survey, an experiment, or an observational study?
select...
Mathematics, 01.10.2019 17:30 edjiejwi
Does each situation describe a survey, an experiment, or an observational study?
select survey, experiment, or observational study for each situation.
survey, experiment, observational study
patients who visit a clinic for the first time are asked to answer 15 questions about their health history.
a researcher randomly chooses 20 patients who come to the clinic with the flu and gives them an experimental drug. a randomly chosen group of 20 patients who come in with the flu receive a placebo.
a doctor at the clinic asks patients who come in with a headache how many hours of sleep they get on a typical night.
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