According to the Centers for Disease Control, in 2008, 21% of adult Americans age 18 or older

Question:

According to the Centers for Disease Control, in 2008, 21% of adult Americans age 18 or older were current smokers. Treat the results of the Sullivan Statistics Survey as a random sample of adult Americans. Do the survey results suggest that the proportion of adult Americans who are current smokers has declined? Use an α = 0.05 level of signiﬁcance.