In 1944, an organization surveyed 1100 adults and asked, "Are you a total abstainer from, or do you on occasion consume, alcoholic beverages?" Of the 1100 adults surveyed, 418 indicated that they were total abstainers. In a recent survey, the same question was asked of 1100 adults and 363 indicated that they were total abstainers. Complete parts (a) and (b) below. (a) Determine the sample proportion for each sample. The proportions of the adults who took the 1944 survey and the recent survey who were total abstainers are and respectively. (Round to three decimal places as needed.) (b) Has the proportion of adults who totally abstain from alcohol changed? Use the a= 0.05 level of significance.