In order to prevent sampling units from being measured more than one time, survey researchers often use

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Sampling without replacement ensures that each sampling unit is selected only once, preventing it from being measured multiple times. Sampling with replacement allows a unit to be selected multiple times, which would violate the assumption of independence and increase the variance of the estimates. Stratified sampling may or may not involve replacement, so it does not necessarily prevent units from being measured more than once. Unbiased sampling is a desirable property of a sampling method but does not address the issue of repeated measurements of the same unit.

In Order to Prevent Sampling Units from Being Measured More