DA0-002 Data Analysis Practice Question
In time series decomposition, a pattern that repeats at regular intervals (e.g., weekly, yearly) is called:
⚠ Common exam trap
Candidates often confuse cyclical with seasonal — both are repeating patterns, but cyclical has an irregular, multi-year period while seasonality has a fixed calendar period, and the exam relies on candidates glossing over that distinction.
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
Seasonality refers to a pattern that repeats at fixed, calendar-based intervals such as weekly, monthly, quarterly, or yearly. Because the question specifies 'regular intervals' like weekly or yearly, this is the defining characteristic of the seasonal component in time series decomposition. Seasonality is distinct from trend (long-term direction) and cyclical (irregular multi-year fluctuations).
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
Cyclical
Why it's wrong here
Cyclical patterns fluctuate over multi-year, non-fixed periods tied to economic or business cycles, not regular weekly or yearly intervals. The term tempts because it also describes repetition over time, but its lack of a fixed period distinguishes it from the seasonal pattern the stem describes.
- ✗
Irregular
Why it's wrong here
Irregular components are random, unsystematic residuals left after trend, seasonal and cyclical components are removed; they show no regular recurrence. The label tempts because irregular events do recur, but without a fixed interval, so they cannot match the weekly or yearly periodicity the stem specifies.
- ✗
Trend
Why it's wrong here
A trend is the long-term direction of the series — sustained upward or downward movement — rather than a pattern repeating at fixed intervals. Trend tempts because it is a core decomposition component, yet it captures direction over time, not the regular weekly or yearly cycle described.
- ✓
Seasonality
Why this is correct
Seasonality describes a repeating pattern occurring at fixed intervals, such as weekly or yearly cycles, distinct from trend and irregular components. This matches the stem's definition of a pattern repeating at regular intervals within time series decomposition.
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Last reviewed September 2026 · checked against the official CompTIA exam blueprint
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