In order to achieve a margin of error of plus or minus 3%, a sample should be at least ______ individuals.

Question

Quizplus · Accepted Answer

The sample size necessary to achieve a margin of error of plus or minus 3% can be calculated using the formula: Sample size = (Z-score)^2 * (p)(1-p)/(margin of error)^2. Assuming a Z-score of 1.96 for a 95% confidence interval and a conservative estimate of 50% for the proportion of the population being studied (which will give the largest sample size), the minimum sample size needed is approximately 1068. Therefore, the best choice is D) 1,000 which is the closest to the calculated value.

In Order to Achieve a Margin of Error of Plus