Katz is researching the causes of phobias. He puts an ad in a newspaper asking for people who have an intense, distressing fear of snakes to come and participate in his study. The major problem with this is

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The major problem with Katz's ad is that it is not getting a representative sample. By only advertising for people with a fear of snakes, Katz is likely to attract a biased sample that is not representative of the general population. For example, people who are not afraid of snakes may not respond to the ad, and people who are afraid of other things may not be included in the study. This can make it difficult to generalize the findings to the broader population or to draw conclusions about the causes of phobias based solely on this sample.

Katz Is Researching the Causes of Phobias