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How would I criticise these methods?

* Stand outside railway station and select people randomly

*Select telephone numbers at random from a directory and telephone them
Original post by questioner...
* Stand outside railway station and select people randomly

*Select telephone numbers at random from a directory and telephone them


You should criticise them from the point of view of giving you an unbiased sample that is representative of the population you are trying to investigate. Looking at the examples, would they give you a biased sample or not?


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