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(a) Consider the following seven (7) values of a time series: t 1 2 3 4 5 Z 23 19 15 18 14 21

(a) Consider the following seven (7) values of a time series: t 1 2 3 4 5 Z 23 19 15 18 14 21 20 162 7 (i) Compute 1 and 2. (ii) Compute 11 and $22 using a(i). (4 + 4 marks) (1 + 3 marks)

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