[Answer] A program that was intended to cure a person's fear of spiders was offered at a local zoo. Volunteers with a fear of spiders participated in the program which included holding a spider for 15 minutes. One month after they completed the program the participants were contacted and surveyed about the program. Over 90 percent of the participants claimed they were cured of their fear of spiders. Based on the description of the program which of the following statements is true?

Answer: Because the participants were self-selected a person's desire to be cured could be a confounding variable.

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A program that was intended to cure a person's fear of spiders was offered at a local zoo. Volunteers with a fear of spiders participated in the program which included holding a spider for 15 minutes. One month after they completed the program the participants were contacted and surveyed about the program. Over 90 percent of the participants claimed they were cured of their fear of spiders. Based on the description of the program whi...

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