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Suppose that {Yt } is stationary with autocovariance function γk. (a) Show that Wt = ∇Yt = Yt − Yt − 1 is stationary by finding the mean and autocovariance function for {Wt }. (b) Show that Ut = ∇2Yt = ∇[Yt − Yt−1] = Yt − 2Yt−1 + Yt−2 is stationary. (You need not find the mean and autocovariance function for {Ut }.)
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Marking brainliest! def undergoes a dilation, with a scale factor of 4, to form d'e'f. side d'e'is 4 times the length of side de. what is the area of d'e'f', compared to the area of def?
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Suppose that {Yt } is stationary with autocovariance function γk. (a) Show that Wt = ∇Yt = Yt − Yt −...
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