In a study of self-medication practices, a random sample of 1,230 adults completed a sur...

In a study of self-medication practices, a random sample of 1,230 adults completed a survey. The survey reported that 441 of the persons had a cough or cold during the past month and 260 of these individuals said they had treated the cough or cold with an over-the-counter (OTC) remedy. The data are summarized next.

a. Provide a graphical display of the above data using percentages. Do your percentages add to 100%? Why or why not?

b. Based on the above data, what classes of OTC remedies could you validly obtain a 95% confidence interval for the corresponding population proportion ?? ?