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A teacher looked at 2 different homework problems from each assignment given last term.

Question: A teacher looked at 2 different homework problems from each assignment given last term. Each assignment had an equal number of problems.
Is this sample of the homework problems assigned 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 teacher divided the problems into equal-sized groups by assignment and then chose an equal number of problems from each assignment, it is a representative sample. It is not likely to be a biased sample.
Then the option is (2) No.

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