The accompanying data are from the New York Stock Exchange Composite Index for the period August 9 through September 17, 1982. Run a program to plot these data in order to assess the lack of independence of successive observations. (Note that the data cover five days per week, except for a holiday on Monday, September 6). The daily volume is the number of transactions given in millions of shares. This time period saw an unusually rapid rise in stock prices (especially for August), coming after a protracted falling market. Compare this time series with prices for the current year.

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Day Month Index Volume Day Month Index Volume 9 Aug. 59.3 63 1 Sept. 67.9 98 10 Aug. 59.1 63 2 Sept. 69.0 87 11 Aug. 60.0 59 3 Sept. 70.3 150 12 Aug. 58.8 59 6 Sept. 13 Aug. 59.5 53 7 Sept. 69.6 81 16 Aug. 59.8 66 8 Sept. 70.0 91 17 Aug. 62.4 106 9 Sept. 70.0 87 18 Aug. 62.3 150 10 Sept. 69.4 82 19 Aug. 62.6 93 13 Sept. 70.0 71 20 Aug. 64.6 113 14 Sept. 70.6 98 23 Aug. 66.4 129 15 Sept. 71.2 83 24 Aug. 66.1 143 16 Sept. 71.0 93 25 Aug. 67.4 123 17 Sept. 70.4 77 26 Aug. 68.0 160 27 Aug. 67.2 87 30 Aug. 67.5 70 31 Aug. 68.5 100