Question: a. An autoregressive model is given by: Yt = 20.58 + 0.046 yt-1 + 0.01Yt-2 where Y, = sales of a product. Explain the meaning

a. An autoregressive model is given by:
Yt = 20.58 + 0.046 yt-1 + 0.01Yt-2
where Y, = sales of a product. Explain the meaning of the terms in this autoregressive model.
b. Write the expressions for the following models:
AR(3) MA(4)
AR(4) ARMA(1,2)
MA(3) ARIMA(2, 1,2)

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