In statistics, sample and population are two very important terms. They have a whole different meaning in statistics. Population is the whole set of interests (people, places, objects etc) from which the data can be collected for a statistical research. On the other hand, sample is a part of population (since it is very big) and represents the whole population. Instead of collecting data from whole population, it is collected from its sample.
The part of statistics that is performed on samples is known as sample statistics.
In other words, the calculation of statistical parameters on a sample is referred as its sample statistics.
Following important terminologies are frequently used is sample statistics :
Sample mean is defined as average of the given sample.
The formula for sample mean (ungrouped data) is given below:
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