What is Margin of Error?
The margin of Error is a criterion, based on sample size, which helps determine your level of confidence in your research findings.
The margin of error is a statistical expression of the amount of random sampling error in the results of a survey. The larger the margin of error, the lower the confidence that the election result will reflect the result of a census of the entire population.
Whenever an incomplete sample of a population is taken the margin of error will be positive and the result is a positive variation in the measure, i.e. the measurement is different.
A margin of error tells you how many percentages points your results will differ from the actual population value.
For instance, a 95% confidence interval with a 4 percent margin of error means that your statistic will be within 4 percentage points of the true population value 95% of the time.