The only perfectly accurate sample is a census.

Name: The only perfectly accurate sample is a census.
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Quizplus · Accepted Answer

A census is a survey that attempts to include everyone in a population and provides a complete count of the population, therefore making it the only perfectly accurate sample. Other sampling methods involve selecting a smaller subset of the population, which can introduce sampling bias and reduce the accuracy of the results.

The Only Perfectly Accurate Sample Is a Census