In 2001, 23% of American university undergraduate students had at least one tattoo. A health practitioner suspects that the percent has changed since then. She obtains a random sample of 1026 university undergraduates and ?nds that 254 have at least one tattoo. Is this suf?cient evidence to conclude that the proportion is different from 0.23 at the ? = 0.1 level of signi?cance?

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