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Front	IQR
Back	$Q_3 - Q_1$+ ignores extremes

Front	Sampling units
Back	individuals of a population

Front	Systematic sampling [random]
Back	take every kth unit, k = $\frac{pop}{sam}$pick a random number between 1 and k, that is starting point+ quick to use-need sampling frame

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EDEXCEL A level maths stats

Sample Data