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The Centers for Disease Controf reported the percentage of people 18 years of age and older who smoke {CDC website, December 14, 2014}. Suppose that a study designed to collect new data on smokers and nonsmokers uses a preliminary estimate of the proportion who smoke of .25. a. How large a sample should be taken to estimate the proportion of smokers in the population with a margin of error of .02 (to the nearest whole number)? Use 95% conﬁdence. | 1so1|® b. Assume that the study uses your sample size recommendation in part (a) and ﬁnds 520 smokers. What is the point estimate of the proportion of smokers in the population {to 4 decimals)? | .2887 | @ c. What is the 95% conﬁdenoe interval for the proportion of smokers in the population (to 4 decimals}? (IEIQIEIO)

July 20, 2019/in Questions Uploads /by admin

The Centers for Disease Controf reported the percentage of people 18 years of age and older who smoke {CDC website, December 14, 2014}. Suppose
that a study designed to collect new data on smokers and nonsmokers uses a preliminary estimate of the proportion who smoke of .25. a. How large a sample should be taken to estimate the proportion of smokers in the population with a margin of error of .02 (to the nearest whole
number)? Use 95% conﬁdence. | 1so1|® b. Assume that the study uses your sample size recommendation in part (a) and ﬁnds 520 smokers. What is the point estimate of the proportion of
smokers in the population {to 4 decimals)? | .2887 | @
c. What is the 95% conﬁdenoe interval for the proportion of smokers in the population (to 4 decimals}? (IEIQIEIO)