HITRUST provides sampling guidance in the CSF Assessment Methodology and scoring rubric for manual controls. Sample sizes are determined by the population of items and the control’s frequency. For a population of 56 items, the expected sample size is 8, following HITRUST’s defined sampling table. This approach is based on statistical sampling principles but simplified for consistent assessor use. The sample must be randomly selected and representative of the entire population to avoid bias. Larger populations require larger sample sizes, but at certain thresholds, the increase is incremental. For example, a population between 26–100 items requires a sample size of 8. This ensures sufficient testing coverage without requiring a full census. Therefore, the correct sample size for 56 items is 8.
[References: HITRUST CSF Scoring Rubric – “Sampling Requirements for Manual Controls”; CCSFP Study Guide – “Sampling by Population Size.”, , ]
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