Answered

You want to know the brand of jeans worn mostly by people to 20 to 30 years old. Which of the following surveys is biased?

Answer :

93x62ND

The correct answer is:

A) surveying people 20 to 30 years old at a store that only sells one brand of jeans.

The survey is about jean brands, not about jeans. It's undoubtedly the first option.

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