$($a$).$ Plot The monthly Australian electricity demand and comment on any patterns you see. What are the time series components you can visualize from the time series plot? Is it multiplicative or additive? What else can you conclude from it$?$

Dataset: $$elec$\{$fma$\}$ ; Choose the starting year as $1980$ and make sure to convert the data to a time series object.

$($b$).$ Use the decompose$()$ or stl$()$ to decompose the series and comment on each ts component as we did during the Lab and in the lecture.Compare your answers with your answers to part a$.$

$($c$).$ Subtract the seasonal component from the original process and plot it$.$ Discuss the results.

$($d$).$ Divide the trend component from the original process and plot it and Discuss the results. $($e$).$ Is one of these methods $($b$)$ or $($c$)$ not entirely correct? If so$,$ which one? $($Hint: Subtracting or dividing depends on whether the series is $$Additive$$ or $$Multiplicative$)$