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'''Random sampling''' is a [[statistical]] technique which gives everyone in the target group the same opportunity to participate in a [[poll]].
'''Random sampling''' is a [[statistical]] technique which gives everyone in the target group the same opportunity to participate in a [[poll]]. Moree exactly, everyone has a known probability of selectionb. This ensures the '''validity''' of the poll, meaning that the results reflect the target population.
The '''reliability''' of a poll is a different dimension and refers to the amount of random error still present. The larger the poll, the smaller the random error. (Increasing the size of a poll by X reduces the error by the square root of x. A poll with 4 times as many people will have half the random error.)
An example is all eligible voters being equally likely to be included in a poll. This method does not ensure accuracy, but increases its likelihood.
An example is all eligible voters being equally likely to be included in a poll. This method does not ensure accuracy, but increases its likelihood.