Question

question 1 of 10
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 doesnt use it
b. collecting the cholesterol readings of a group of elderly
people in a small town
c. interviewing college students to find what percentage
expect a job immediately after graduation
d. calling a sample of registered voters before an election
to find out what issues concern them most

Explanation:

An experiment involves manipulating a variable (using the hair product or not) and comparing outcomes. Option A has a control group (doesn't use) and an experimental group (uses), which is the structure of an experiment. Options B (collecting existing data), C (interviewing - observational/survey), and D (calling - survey/observational) do not involve such manipulation and comparison as in a true experiment.

Answer:

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