DA0-002 Data Analysis Practice Question
A data analyst has a time series of monthly sales data. They observe that sales are consistently higher every December and lower every January. Which component of time series does this pattern represent?
⚠ Common exam trap
The trap is picking cyclical because both involve repetition — but cyclical spans irregular multi-year periods while seasonality is locked to a fixed calendar period like December, and the exam expects you to spot the calendar anchor.
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 pattern that repeats every December (high) and every January (low) is tied to the calendar year, which is the defining characteristic of seasonality. Seasonal components repeat at fixed, known periods — here, an annual cycle with monthly data.
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 variation is random, unpredictable movement with no fixed period, so it cannot explain sales rising every December and falling every January. It is tempting because both are residual components, but a recurring calendar-linked pattern is seasonal, not irregular.
- ✗
Cyclical
Why it's wrong here
Cyclical components repeat over multi-year, non-fixed periods tied to economic or business cycles, not at the same calendar point annually. It is tempting because both describe recurring movement, yet December and January recur every twelve months, which defines seasonality.
- ✓
Seasonality
Why this is correct
Seasonality describes repeating, calendar-linked fluctuations within a fixed period, such as December peaks and January troughs each year. The consistent annual recurrence in the monthly sales series identifies this component rather than trend or cyclical variation.
- ✗
Trend
Why it's wrong here
Trend describes a long-term upward or downward direction across the series, not a repeating within-year pattern. It is tempting because sales movement over time is involved, but a consistent December peak and January trough recurring annually is seasonal variation, not trend.
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Senior Network & Security Engineer · founder of Courseiva
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.