According to a governmentagency, 16.2% of the population of a certain country smoked in 2016. In 2018, a random sample of 638 citizens of that country wasselected, 90 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

0.114

0.114 and an upper limit of

0.168

0.168.

(Round to three decimal places asneeded.)

b. What is the margin of error for thissample?

The margin of error is

nothing

.

(Round to three decimal places asneeded.)