Alejandro wants to determine the average shoe size of all of the male students in his school. Which sample is likely to yield the most biased results?

The boys’ basketball team is a specialized group, and its members may tend to have larger shoe sizes than male students overall. That makes the sample unrepresentative and likely to produce the most biased estimate. A random gym class or students selected from the phone list or school entrance is more likely to include a broader mix of students.

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