Binge drinking in U.S. colleges. Alcohol abuse is a serious problem on college campuses. A nationwide survey of students at 4-year colleges found that 3314 of the 17,096 student respondents met the criterion for being a “frequent binge drinker” (five or more drinks in a row three or more times in the past 2-week period).w Assume data represent an SRS of 4-year colleges.

(a) Calculate the observed prevalence of frequent binge drinking.

(b) Calculate a 95% confidence interval for p.

(c) Data were self-reported. In addition, the response rate was 69%.

How might these facts influence the estimates?