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CISM study material · question 679 of 1000

Which weakness does NIST identify in systematic sampling?

  1. It may not provide conclusive measurements for the whole population if an underlying pattern is present
  2. It requires the whole population to be segmented into separate strata before any of the sampling work can begin in the first place
  3. It cannot identify any of the macro-trends that run right across the whole population from which the sample is drawn
  4. It cannot be applied where the population is large enough to require automated collection of all the underlying data
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Answer: A. It may not provide conclusive measurements for the whole population if an underlying pattern is present

SP 800-55v1 takes systematic samples at a fixed interval, good for macro-trends, but warns that a pattern running through the population can leave the results inconclusive for it.

Source: NIST SP 800-55 Vol. 1 (NIST) — Sec. 2.1 Measurement and Quantitative Assessment

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