It may not be possible to use a probability sample to observe behaviour in public places because ........

It may not be possible to use a probability sample to observe behaviour in public places because:

The findings of such studies are not intended to have external validity

It is not feasible to construct a sampling frame of interactions

It is difficult to gain access to such social settings

Researchers prefer not to use random samples whenever possible

It is not feasible to construct a sampling frame of interactions

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