(1) A random sample of 300 Oberlin students was asked if they regularly smoke marijuana. 60 replied in the affirmative. Find an approximate 95 % Confidence interval on the true proportion, p, of Oberlin marijuana smokers.

(2) It was found that 66 % of a sample of 670 infants had completed the hepatitis B vaccine. Can we conclude on the basis of these data that in the sampled population, more than 60 % have completed the series? Use = 0.05