Question: Consider the process xt = 5 + 4t 2 +st +wt, where wt ~ wn(0, 02 ) and st is a seasonal component with period

Consider the process xt = 5 + 4t 2 +st +wt,

Consider the process xt = 5 + 4t 2 +st +wt, where wt ~ wn(0, 02 ) and st is a seasonal component with period four. Find a differenceng scheme that makes xt stationary, and compute the ACVF for the stationary process that you obtain after doing the differenceng

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