A. A single, constant base period for all comparisons
B. The immediately preceding period as the base for each calculation
C. A different base period for each time point
D. Geometric mean of multiple base periods
Answer: Option A
Solution (By JKSSB Mock Tests)
Fixed base index selects one period as the base (index=100) and expresses all other periods relative to it, enabling consistent long-term trend analysis without base drift.
Explanation:
Standard deviation measures dispersion; a larger SD indicates greater variability of observations around the mean, regardless of the mean's value or distribution shape.
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