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Suppose that the process {xf} develops according to with a:I = a}; for t=1,2,3,4. Find (a) the variance function for {x3}, (b) antocorrelation function for

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Suppose that the process {xf} develops according to with a:I = a}; for t=1,2,3,4. Find (a) the variance function for {x3}, (b) antocorrelation function for {35:}: (c) identify the model as a certain seasonal ARIMA model

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