<prompt> Variation of Sample mean from Population mean is:Standard error of the meanStandard error of propoionStandard error of difference between two meansStandard error of difference between two propoions  <response>: Standard error: It is the variation of sample mean from population mean. Sample mean is known as statistic. Population mean is known as parameter. - Standard detion is the variation in a single value from the mean of a sample. 