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CISM study material · question 678 of 1000

Which two characteristics does NIST attribute to stratified sampling? Choose two.

  1. It can provide biased results
  2. It segments the population to minimise variability within each segment
  3. It takes samples at a regular fixed interval
  4. It gives every item in the population an equal chance of being selected into the sample
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Answer: B. It segments the population to minimise variability within each segment
A. It can provide biased results

SP 800-55v1 defines stratified sampling as segmenting a population across levels of some factor to minimise variability within segments, noting it may help target organisational units without being overwhelmed by noisy collection but can provide biased results.

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

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