In their book Forecasting and Time Series Analysis, 2nd edition (McGraw-Hill, 1990), D. C. Montgomery, L. A. Johnson, and J. S. Gardiner analyze the data in Table 6-5, which are the monthly total passenger airline miles flown in the United Kingdom, 1964–1970 (in millions of miles).
(a) Draw a time series plot of the data and comment on any features of the data that are apparent.
(b) Construct and interpret either a digidot plot or a stem-and leaf plot of these data.