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Erica polled the first 12 runners to finish a marathon.

Question: Erica polled the first 12 runners to finish a marathon.
Is this sample of the runners likely to be biased?
(1) Yes
(2) No

Solution:

REMEMBER : In a biased sample, some people or items are more likely to be chosen than others.

Since the fast runners might not be similar to the other runners, it is likely to be a biased sample.
Then the option is (1) Yes

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