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The autocorrelation function of a time series shows coefficients significantly different from zero at lags 1 through 3. The partial autocorrelation function shows one spike

The autocorrelation function of a time series shows coefficients significantly different from zero at lags 1 through 3. The partial autocorrelation function shows one spike and monotonically increases to zero as lag length increases. Such a series can be modeled as a _______ model.

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