Question bank / Evaluating statistical claims: observational studies and experiments
A survey of randomly selected members of a city's cycling club found that of them support adding more bike lanes. To which of the following populations can the results of the survey be generalized?
Only the members of the city's cycling club
All residents of the city
All cyclists in the country
Only the members who were surveyed
Answer: A
Results from a random sample can be generalized to the population from which the sample was selected. These members were chosen at random from the cycling club, so the results apply to the club's members. Club members probably support bike lanes more than typical residents, so generalizing to all residents is not justified.
Choice B is tempting because the club is in the city, but the sample did not include residents outside the club.
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