If the sample means are different from the population mean w

If the sample means are different from the population mean, what do we call this discrepancy?

Solution

Sample mean for large number of samples tend to follow a normal distribution with mean = sample mean, and deviation from population mean measured as square

The standard error is the square root of sum of deviations of sample means from mean/ square root of each sample size

Hence the discrepancy is called std error.