Problem 7-23 

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Fit an appropriate ARIMA(0,d,0) to the following data from (0723.wk1)
   
a) Does this series trend or drift?
 
b) Confirm your results with appropriate statistics. (Eviews)
 
c) Write this model using backshift notation.
 
d) Forecast Yt from t = 12 through t = 15.
 

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