Which index number test checks if P₀₁ × P₁₂ × P₂₀ = 1?
A. Time reversal test
B. Circular test
C. Factor reversal test
D. Unit test
Answer: Option B
Solution (By JKExamLibrary)
The circular test verifies consistency across three periods: the product of indices linking 0→1, 1→2, and 2→0 should equal 1 (or 100³ in percentage terms), ensuring transitivity in comparisons.
Explanation:
MMR specifically counts maternal deaths from complications of pregnancy, childbirth, or postpartum (within 42 days), excluding accidental or incidental causes, per WHO definition.
Explanation:
Census is a complete count of a population. Demography also studies composition, distribution; vital statistics includes marriages; migration affects population change.
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