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S.5) A stationary time series does not depend on present time.Since given model hes e_{+}and e_{t-1} factors only, the series can be made stationary usingCorrect option \rightarrow C) By First difference of the series6) Given process \rightarrowy_{t}-y_{t-1}=e_{t}-0,6 e_{t-1}using backshift notetion, B y_{t}=y_{t-1}\begin{array}{l}y_{t}-B Y_{t}=e_{t}-0,6 B e_{t} \\y_{t}(1-B)=(1-0,6 B) e_{t}\end{array}Correct optiòn \rightarrow(A)7) Proces given is y_{t}-y_{t-1}=e_{t}-0,6 e_{t-1}The IMA (1,1) is a rendom walk \operatorname{model} with an additional - lagged error term Qet-1 correct oftion \rightarrow B)   NOTE** - If you have any doubts or need extra explanation, please comment. Thank you. ...