Question: Table P-10 contains a time series of 80 observations. Using a computer program for ARIMA modeling, obtain a plot of the data, the sample autocorrelations,
Table P-10 contains a time series of 80 observations. Using a computer program for ARIMA modeling, obtain a plot of the data, the sample autocorrelations, and the sample partial autocorrelations. Develop an appropriate ARIMA model, and generate forecasts for the next three time periods from forecast origin t = 80.
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TABLE P-10 1 91.5 21 1815 125. 6 155.6 2 93.0 22 183.0 42 119.0 62 169.3 3 106.8 23 167.8 43 1174 63 173.8 4 109.8 24 143.3 44 115.9 64 170.8 5 114.4 25 132.7 45 94.5 65 158.6 6 106,8 26 134.246 90.0 66 1510 7 105.2 27 134.2 47 135.7 67 1510 8 115.9 28 126.6 48 114.468 158.6 9 1235 9 122.0 49 106.8 69 169.3 10 131.2 30 131.2 50 91.5 70 199.8 11 138.8 31 151051 96.1 71 222.7 12 140.3 32 161.7 52 106.8 72 233.3 13 120.5 33 163.2 53 108.3 73 250.1 14 125.1 34 163.2 54 93.0 74 271.4 15 134.2 35 152.555 93.0 75 273.0 16 138.8 36 1312 56 120.5 76 273.0 17 152.5 37 122.0 57 1312 77 269.9 18 164.7 38 26.6 58 129.6 78 260.8 19 161.7 39 129,6 59 143.3 79 260.8 20 163.2 40 125.1 60 151.0 0 266.9 3
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