A fire in a factory delaying production for some time is:
Answer & explanation
Correct answer: option 4
The correct answer is Option (4) → Irregular trend
A fire is a sudden, unpredictable, one-time event, so the change it causes in production is an irregular (random) variation of the time series.
Why the other options are incorrect
Option (1) Long term trend — Incorrect. The long term trend is the general tendency of the series over many years.
Option (2) Cyclical trend — Incorrect. Cyclical variations are the rises and falls of business cycles, lasting more than a year.
Option (3) Seasonal trend — Incorrect. Seasonal variations repeat regularly within a year (festivals, weather).
CBSE Applied Mathematics (Class XII):
Time Series Analysis
