Which is an example of an experiment? A. Testing the effectiveness of a new hair product by allowing one group to use it and comparing results against a group that doesn't use it B. Collecting the cholesterol readings of a group of individuals of a certain age group in a small town C. Calling a sample of registered voters before an election to find out what issues concern them most D. Finding out the number of monthly burglaries of a residential neighborhood for a statistical study for the police
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