DA0-002 Data Analysis Practice Question
A stock analyst is analyzing monthly sales data for a retail company and observes a consistent pattern of high sales every December. This pattern is most likely an example of which time series component?
⚠ Common exam trap
The trap is confusing seasonality with trend — a December spike repeats every year (seasonal), whereas trend would be a steady multi-year rise or fall in sales, and the exam tests whether you anchor on the calendar periodicity.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
Seasonality
A consistent spike every December is a calendar-driven repeating pattern, which is the definition of seasonality in time series analysis. The fixed annual period (12 months) and predictable timing make this a classic seasonal component.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Irregular
Why it's wrong here
Irregular components are random, unpredictable shocks such as a one-off supply failure or strike, so they cannot produce a repeatable December peak. Irregular would be the answer if sales spiked once without any recurring calendar pattern.
- ✗
Cyclical
Why it's wrong here
Cyclical components span multiple years and are tied to economic cycles, not a fixed calendar month. December peaks recur annually, which defines seasonality. Cyclical would fit a downturn lasting several years, such as reduced spending across consecutive Decembers during a recession.
- ✓
Seasonality
Why this is correct
Seasonality describes a repeating pattern that recurs at fixed intervals shorter than a year, such as peak sales every December. This matches the stem's consistent annual December spike, distinguishing it from trend, which is a long-term directional movement.
- ✗
Trend
Why it's wrong here
Trend describes a sustained long-term increase or decrease across the series, whereas a spike recurring every December is seasonal. It is tempting because December sales do rise, which would be correct if the pattern persisted directionally across years rather than repeating within each annual cycle.
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Last reviewed September 2026 · checked against the official CompTIA exam blueprint
This DA0-002 practice question is part of Courseiva's free CompTIA certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the DA0-002 exam.