Consider the AR(1) model Yt = 5 - 0.55Yt-1 + t and assume that = 1.2.

Consider the AR(1) model
Yt = 5 - 0.55Yt-1 + ∈t
and assume that σ²∈ = 1.2.
(a) Is this process stationary? Why or why not?
(b) What is the mean of this process?
(c) What is the variance of this process?
(d) What is the covariance function of this process?