Discussion
Data collection by any method should be scrutinized by
Answer: D
The key is that data collection should be scrutinised by examining the consistency in the data collected. Internal consistency checks, such as that a mother is older than her children or that the number of births matches the number of women of childbearing age, find errors in the data.
Taking a sample of units and verifying them in the field is a separate post-enumeration check. Examining the information in totality is too vague to be a method, and consistency in the unit of measurement covers only one narrow kind of error, so the more general option is the one in the key.
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