Question

In a test for extrasensory perception (ESP), described in Case Study 13.1 in the next chapter, people were asked to try to use psychic abilities to describe a hidden photo or video segment being viewed by a “sender.” They were then shown four choices and asked which one they thought was the real answer, based on what they had described. By chance alone, 25% of the guesses would be expected to be successful. The researchers tested 354 people and 122 (about 34.5%) of the guesses were successful. In both parts (a) and (b), express your answer in a full sentence.
a. What are the odds of a successful guess by chance alone?
b. What were the odds of a successful guess in the experiment?


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  • CreatedOctober 22, 2015
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