The sample is a subset of the population.
For example, the population may be all the people at your school. A sample might
be 5 people from each class.
There are different types of sampling methods. The most commonly used is a simple random sample. When your obtain data from the entire population this is called a census.
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Information obtained from the sample can be extrapolated to the whole population using statistics.
A sample is a subset of the population.
The sample is a subset of the population.
It is not a sample. A sample must be a proper subset of the whole population.
A representative sample is one where the statistics of the sample are the same as the statistics for the parent population.