12.26 Drinking Habits. A Reader's Digest/Gallup Survey on the drinking habits of Americans estimated the percentage of adults across the country who drink beer, wine, or hard liquor at least occasionally. Of the 1516 adults interviewed, 985 said that they drank. a. Determine a 95% confidence interval for the proportion, p, of all Americans who drink beer, wine, or hard liquor at least occasionally. b. Interpret your result from part (a).