If a time series index shows that prices have doubled from base year, the index is: MCQ with Answer and Explanation

Explanation:
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:
When class widths differ, area represents frequency, so height = frequency / width.

Explanation:
Q = 1 means ad = bc? Actually Q=1 when bc=0, i.e., perfect positive association.