This is an example of 
Definitions:
Sampling Distribution
The calculated probability distribution relevant to a specific statistic, achieved by random sampling.
Sample Mean Difference
The difference between the average values of two samples drawn from a population.
Populations
The entire pool from which a statistical sample is drawn and to which inferences are aimed in statistics.
Expected Value
The long-term average or mean of a random variable over many trials or occurrences.
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