Problem:
Solution:
Who will win the next U.S. presidential election?
Population: All voters in US
Sample: Some voters in US that one can pick.
Is my well water safe?
Population: Everyone that can access the well.
Sample: The owner of the well, or maybe his families.
Are as many girls born as boys in the world?
Population: Everyone on the planet.
Sample: Some people on the planet one can pick.
Which work better, Advil or Tylenol?
Population: We need to be more specific with the question - presumably the question is asking which of the two drugs are better in treating cold, if so, the population is the set of all patients with cold.
Sample: Some set of people having cold have cold.
Do student who take more math classes in high school get into better colleges?
Population: All high school students
Sample: Some high school students.
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