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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.

 Apr 15, 2019
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survey

Experiment

observational study

 May 30, 2019

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