A report from a Gallup poll in 2011 started by saying, ‘‘Forty-five percent of American adults reported getting their health insurance from an employer...” Later in the article we find information on the sampling method, ‘‘a random sample of 147,291 adults, aged 18 and over, living in the US,” and a sentence about the accuracy of the results, ‘‘the maximum margin of sampling error is ±1 percentage point.”

(a) What is the population? What is the sample? What is the population parameter of interest? What is the relevant statistic?
(b) Use the margin of error to give an interval estimate for the parameter of interest. Interpret it in terms of getting health insurance from an employer.