Question: Compute the acf for the following AR(2) processes and plot their correlograms: (a) X, 1.0X-1 0.5X-2+6. (The acf is given in the text. Just plot

Compute the acf for the following AR(2) processes and plot their correlograms:

(a) X, 1.0X-1 0.5X-2+6. (The acf is given in the text. Just plot the correlogram.) 0.2X-2+1.

(b) X=0.9X-1

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