Which flaw in reasoning is illustrated by the statement about the Boston Pops being outstanding musicians just because three of them are performing at camp?

The statement about the Boston Pops' musicianship being judged solely based on the performance of three of them at camp illustrates the flaw known as hasty generalization. This reasoning flaw occurs when a conclusion is drawn about an entire group based on an insufficient or unrepresentative sample. In this case, inferring that all members of the Boston Pops are outstanding musicians, simply because a few are performing well in a specific setting, does not provide adequate evidence to support such a broad claim about the entire orchestra.

The underlying issue is that three individuals performing at camp do not necessarily reflect the skill level or professionalism of the entire Boston Pops ensemble. Making a sweeping judgment about the whole group based on the performance of a tiny subset lacks sufficient basis and leads to an overgeneralization, making this an example of hasty generalization.