Use the following information to answer the question. Which treatment is most effective at treating carpet stains: vinegar, ammonia, or hydrogen peroxide? In a study, researchers randomly assigned 55 carpet samples with identical stains to one of three groups. Depending on which group they were assigned to, each carpet sample received a home remedy of water mixed with vinegar, ammonia, or hydrogen peroxide. Afterwards, each carpet sample was examined and any remaining stain was measured. Researchers found that a vinegar and water mixture produced better results than both ammonia and hydrogen peroxide.
-Was this a controlled experiment or an observational study?
A)Observational Study
B)Controlled Experiment

Question

Quizplus · Accepted Answer

This was a controlled experiment because the researchers randomly assigned treatments to the carpet samples and controlled the conditions under which the treatments were applied.

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