The larger the sample of data collected leads to a more accurate conclusion.
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Statistical concept that larger the sample population (or the number of observations) used in a test, the more accurate the predictions of the behavior of that sample, and smaller the expected deviation in comparisons of outcomes.
A Sample to a Population
A biased sample is a Statistical Sample in which the sample is biased or have more samples of the things that is being influenced.
It is a statistical measure that helps you understand the sample/population data.
http://en.wikipedia.org/wiki/Statistical_power