0 (White noise is not necessarily i.i.d.). Suppose that {Wt} and {Z} are independent and identically distributed (i.i.d.) sequences, also independent of each other, with P(Wt = 0) = P(Wt = 1) = 1/2 and P(Zt = 1) = P(Zt = 1) = 1/2. Dene the time series X; by X7; = Wt(1 Wt_1)Zt. Show that {Xt} is white but not i.i.d. 1Here \"by hand\" means: do not use acf(), but rather write your own code. (It does not mean that you should actually use a calculator) You could use acf() to check your results for your own edication, but this should not be included in the output