Marcos asked a random sample of 50 mall shoppers for their weight. Twenty-five of the shoppers were
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Marcos asked a random sample of 50 mall shoppers for their weight. Twenty-five of the shoppers were asked directly and the other 25 were asked anonymously by means of a “secret ballot.” The mean reported weight was 13 pounds heavier for the anonymous group. Explain why the two means are so different.
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