Sampling error

 SAMPLING ERROR                                   Sampling error is the difference between a population parameter and a sample statistic used to estimate it.statistical error that occurs when an analyst does not select a sample that represents the entire population of data. As a result, the results found in the sample do not represent the results that would be obtained from the entire population. Sampling is an analysis performed by selecting a number of observations from a larger population. The method of selection can produce both sampling errors and non-sampling errors.