Sampling Error
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population is the number of citizens living in a defined geographical area. Sample is a number taken from the population being the sample to research for a topic about the populations' behavior or habit, etc.
standard error
The same basic formula is used to calculate the sample or population mean. The sample mean is x bar and the population mean is mu. Add all the values in the sample or population and divide by the number of data values.
0. The expected value of the sample mean is the population mean, so the expected value of the difference is 0.
perameter is a measure of population or universe, statistic is a measure of a sample data drawn from population