Consider the chemical process temperature readings referred to as Series C in this book.

(a) Plot the original series and the series of first differences using R.

(b) Use the R package to calculate and plot the ACF and PACF of this series. Repeat the calculation for the first and second differences of the series.

(c) Specify a suitable model, or models, for this series. Use the method of moments to obtain preliminary parameter estimates for the series.