easy · GMAT Verbal Reasoning
An unrepresentative sample is one whose members differ systematically from the population a study aims to describe.
Which of the following is an example of an unrepresentative sample?
- Selecting 500 people at random from a city's full phone directory for a local opinion poll.
- Surveying only professional athletes to determine the average fitness level of the general population.
- Surveying 1,000 randomly selected eligible voters from across the entire nation about an election.
- Measuring a randomly chosen subset of items from a large shipment to estimate the entire shipment's quality.
- Testing every tenth finished product as it moves along an assembly line in order to detect manufacturing defects.
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