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What is meant by the trend component of a time series? how is a linear trend different from a nonlinear trend?
a) The trend component is the long-term increase or decrease in a variable being measured over time.
b) The trend component is a wavelike pattern that is repeated throughout a time series and has a recurrence period of at most one year.
c) The trend component represents changes in time-series data that are unpredictable and cannot be associated with a seasonal, cyclical, or random component.
d) The trend component is a wavelike pattern within the time series that repeats itself throughout the time series and has a recurrence period of more than one year.

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