A matched sample design often leads to a smaller sampling error than the independent sample design because variation between sampled items is reduced or eliminated as a source of sampling error.

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In a matched sample design, each member of one sample is paired with a member of the other sample based on certain characteristics, reducing variability between the pairs and thus often leading to a smaller sampling error compared to an independent sample design where such pairing is not done.

A Matched Sample Design Often Leads to a Smaller Sampling