According to a government agency, 19.6% of the population of a certain country smoked in 2016. In 2018, a random sample of 540 citizens of that country was selected, 93 of whom smoked. Complete parts a through c. . . . . . a. Construct a 95% confidence interval to estimate the actual proportion of people who smoked in the country in 2018. The confidence interval has a lower limit of and an upper limit of (Round to three decimal places as needed.) b. What is the margin of error for this sample? The margin of error is (Round to three decimal places as needed.) c. Is there any evidence that this proportion has changed since 2016 based on this sample? This sample evidence that this proportion has changed since 2016, since the