Like crude rates, SDR is typically expressed per 1,000 standard population to maintain consistency and readability, though the base can vary by convention (e.g., per 100,000 for rare events).
Time reversal test in index numbers implies that if the base and current periods are interchanged, the resulting index should be the ______ of the original.
Explanation:
For independent events, P(A∩B)=P(A)P(B)=0.3×0.4=0.12. Then P(A∪B)=P(A)+P(B)-P(A∩B)=0.3+0.4-0.12=0.58, applying the addition theorem with the independence condition.
Explanation:
Stratified sampling divides the population into homogeneous subgroups (strata) and samples from each, ensuring representation of all key segments and improving precision for subgroup analysis.
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