hard20 pts · first answer countsstatisticssampling
Halving the margin of error
A survey of 400 people gives a margin of error of plus or minus 5 points. Roughly how many people do you need to cut it to plus or minus 2.5 points?
A survey of 400 people gives a margin of error of plus or minus 5 points. Roughly how many people do you need to cut it to plus or minus 2.5 points?