According to a government agency, % of the population of a certain country smoked in . In , a random sample of citizens of that country was selected, of whom smoked. Complete parts a through c.

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Part 1

a. Construct a % confidence interval to estimate the actual proportion of people who smoked in the country in .

The confidence interval has a lower limit of

enter your response here and an upper limit of

enter your response here.

(Round to three decimal places as needed.)

Part 2

b. What is the margin of error for this sample?

The margin of error is

enter your response here.

(Round to three decimal places as needed.)

Part 3

c. Is there any evidence that this proportion has changed since based on this sample?

This sample

provides

does not provide

evidence that this proportion has changed since , since the

confidence interval does not include the proportion from 2016.

the margin of error is less than zero.

the margin of error is less than the proportion from 2016.

confidence interval does not include zero.

confidence interval includes zero.

confidence interval includes the proportion from 2016.

the margin of error is greater than the proportion from 2016.

the margin of error is greater than zero.

According to a government agency, 18.8% of the population of a certain country smoked in 2016. In 2018, a random sample of 654 citizens of that country was selected, 111 of whom smoked Complete parts a through c a. Construct a 99% confidence interval to estimate the actual proportion of people who smoked in the country in 2018. and an upper limit of The confidence interval has a lower 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