Determine whether the given description corresponds to an observational study or

Question

Determine whether the given description corresponds to an observational study or an experiment. 18) A marketing firm does a survey to find out how many people use a product. Of the one hundred people contacted, fifteen said they use the product. 19) A clinic gives a drug to a group of ten patients and a placebo to another group of ten patients to find out if the drug has an effect on the patients illness. 20) A sample of fish is taken from a lake to measure the effect of pollution from a nearby factory on the fish. 21) A quality control specialist compares the output from a machine with a new lubricant to the output of machines with the old lubricant.

Explanation / Answer

18) It is observational study

19) It is an experiment

20) It is observational study

21) It is an experiment

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