Margin of error describes the correctness of a survey. It tells, to what extent a particular survey is reliable. It is the measure of confidence level of the survey. Statisticians use a margin of error to define the **uncertainty** and **accuracy** associated with a particular survey or an experiment. More specifically, margin of error is an estimate that illustrates the accuracy of the sample.

**It is defined as the measure of total amount by
which the results of a research are expected to vary from the actual
population. Margin of error is generally calculated as percentages, because most of the survey questions are answered in percentages.**

Margin of error is expressed as:

Population varying from

In this way, the margin of error gives a range in which the actual results would lie and the researcher is confident enough that he is making a gap between the actual population and his sample taken.

The margin of error is the measure of accuracy, It does not measure the amount of bias that may be present in the data while sampling or surveying.

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