[Step-by-Step] The article "Ban on Smoking Shown to Improve Lung Health" (Los Angeles Times, Dec. 9, 1998) reported the results of a study of San Francisco
Question: The article "Ban on Smoking Shown to Improve Lung Health" (Los Angeles Times, Dec. 9, 1998) reported the results of a study of San Francisco bartenders. Of 39 bartenders who reported respiratory problems before a ban on smoking in bars, 21 were symptom free two months after the ban began. Assume that there are more than 400 bartenders in the San Francisco area with respiratory problems. Construct a 95% confidence interval for the proportion of all bartenders who were symptom free two months after the smoking ban.
Deliverable: Word Document 
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