Crude Death Rate is less useful for comparing mortality between countries because it is heavily influenced by:
A. Population age structure
B. Birth rates
C. Data collection methods
D. Migration patterns
Answer: Option A
Solution (By JKSSB Mock Tests)
CDR uses total population, so countries with older populations (e.g., Japan) have higher CDRs even with better age-specific survival than younger populations (e.g., Nigeria), necessitating age-standardization.
Explanation:
An unpublished thesis is a document containing data originally collected by someone else, making it secondary data for another researcher.
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