Question: Exercise 8 of Chapter l includes data on the Japanese exchange rate (EXRJ) by month. On the basis of a time-series plot of these data

Exercise 8 of Chapter l includes data on the Japanese exchange rate (EXRJ) by month. On the basis of a time-series plot of these data and the autocorrelation structure of EXRJ, would you say the data are stationary? Explain your answer.
In exercise

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