30.The tobacco industry closely monitors all surveys that involve smoking. One survey showed that among 785 randomly selected subjects who completed four years of college, 18.3% smoke (based on data from the American Medical Association). You need to construct a 98% confidence interval for the true percentage of smokers among all people who completed four years of college. What value should you use for the critical value?

a.0.014

b.0.028

c.0.032

d.2.055

e.2.325