The population in the study are teenagers who are 13 to 17 years of age and live in the United States.
The sample in the study are the 1953 teenagers who are 13 to 17 years of age and live in the United States.
A population is the party of interest in an experiment. A population consists of all the members of the group.
A sample is a smaller group of the population. A sample is sometimes needed as it might not be feasible or cost effective to access the whole population.
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