6. In October 1947, the Gallup organization surveyed 1100 adult Americans and asked, Are you a total
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6. In October 1947, the Gallup organization surveyed 1100 adult Americans and asked, "Are you a total abstainer from, or do you on occasion consume, alcoholic beverages?" Of the 1100 adults surveyed, 407 indicated that they were total abstainers. In July 2010, the same question was asked of 1100 adult Americans and 333 indicated that they were total abstainers. Has the proportion of adult Americans who totally abstain from alcohol changed? Use the a-0.05 level of significance.\n
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