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 adult s surveyed, 407 indicated that they were total abstainers. In a recent survey, the same question was asked of 1100 adult Americans and 333 indicated that they were total abstainers. Required:
Has the proportion of adult Americans who totally abstain from alcohol changed? Use the α=0.05 level of significance.