Social habits that produce an annual pattern in a time series result in:

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Seasonal variation refers to patterns that repeat on a regular basis within a year, typically caused by social habits or environmental factors that are more common during certain months or seasons. This is the most appropriate choice. Cyclical fluctuation is a broader term that refers to patterns that repeat on a regular basis, but not necessarily within a year. Irregular or random influences describe patterns that do not have a clear or predictable pattern. Secular trend refers to long-term trends over many years or decades, and not just within a single year.

Social Habits That Produce an Annual Pattern in a Time