Question

A new york times article reported that a survey conducted in 2014 included 36,000 adults, with 3.74% of them being regular users of e-cigarettes. because e-cigarette use is relatively new, there is a need to obtain today's usage rate. how many adults must be surveyed now if a confidence level of 95% and a margin of error of 1 percentage point are wanted? a. Assume that nothing is known about the rate of​ e-cigarette usage among adults.

b. Use the results from the 2014 survey.
c. Does the use of the result from the 2014 survey have much of an effect on the sample​ size?

Answer 1

Option b) Use the results from the 2014 survey.

Explanation:

Using the results from the 2014 survey can reduce the sample size needed for the new survey, as it provides a good estimate of the population proportion. This reduces the margin of error and increases the confidence level of the new survey.