A research team estimates that 60% of a certain population has a specific genetic marker, with a margin of error of 4%. If the team wanted to reduce the margin of error to 2% while keeping the confidence level the same, which of the following actions would most likely be necessary?
Decrease the sample size used in the study.
Increase the sample size used in the study.
Change the method of data collection.
Select a different population to study.
