Question: One survey showed that among 785 randomly selected subjects who completed four years of college, 144 smoke and 641 do not smoke (based on data from the American Medical Association).

a) Use the sample data to construct a 98% confidence interval estimate of the percentage of smoking people among those who completed four years of college.

b) Use a 0.01 significance level to test the claim that the rate of smoking people among those who completed four years of college is less than the 22% rate for the general population.