It is not a sample. A sample must be a proper subset of the whole population.
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A sample is a subset of the population.
The sample is a subset of the population.
The formula for calculating the standard error (or some call it the standard deviation) is almost the same as for the population; except the denominator in the equation is n-1, not N (n = number in your sample, N = number in population). See the formulas in the related link.
A representative sample is one where the statistics of the sample are the same as the statistics for the parent population.
convenience sampling consists of two or more sample events.