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  3. . suppose {et : t = −1, 0, 1, . . .} is a se

. Suppose {et : t = −1, 0, 1, . . .} is a sequence...

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Statistics

. Suppose {et : t = −1, 0, 1, . . .} is a sequence of iid randomvariables with mean zero and variance 1. Define a stochasticprocess by xt = et − 0.5et−1 + 0.5et−2, t = 1, 2, . . .

a. Is xt stationary? Show your work.

b. Is xt weakly dependent? Again, show your work.

Plz help. maybe need use SAS to solve it

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