In generalizing from a sample, in order to achieve an error margin of plus or minus 3 percentage points at a confidence level of about 95 percent, what's the smallest random sample we can get away with, regardless of the size of the population?
A)10 percent of the population
B)100
C)500
D)1,000
E)5,000

Question

Quizplus · Accepted Answer

A sample size of 1,000 is generally sufficient to achieve a margin of error of ±3 percentage points at a 95% confidence level, regardless of the population size.

In Generalizing from a Sample, in Order to Achieve an Error