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It is a value calculated from the sample values only.It is a value calculated from the sample values only.It is a value calculated from the sample values only.It is a value calculated from the sample values only.
In a statistical context this is usually called a sample.
Add the values of the variable for all elements in the sample and divide by the number of elements on the sample.
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.
sample data drawn from one population is completely unrelated to the selection of sample data from the other population.