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10 cards from this deck
Regular patterns repeating at specific times in cycles.
Seasonal variation = Actual value - Trend value.
Seasonal variation = 144 - 118 = 26.
Mean = Sum of seasonal variations / Number of observations.
Mean = (26 + 8 + 14) / 3 = 16.
Predicted value = Trend value + Mean seasonal variation.
Predicted value = 112 + 16 = 128.
Trends may not continue; predictions less reliable long-term.
Ice cream sales peak in summer months.
Enrollment peaks during autumn terms, drops in summer.
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