Why this is mistaken
Declare whether the values are a complete population or a sample. This module
divides complete-population squared deviations by N and sample squared
deviations by n - 1; the typed calculation rejects a mismatch.
Where to watch
When this mistake may appear
- Software exposes population and sample variance functions.
- The record role is not declared.
Check your work
Your work may contain this mistake if:
- Uses N and n notation interchangeably.
- Reports a variance without naming sample or complete-population scope.