Table P-15 gives the 120 monthly observations on the price in cents per bushel of corn in Omaha, Nebraska. Determine the best ARIMA model for these data. Generate forecasts of the price of corn for the next 12 months. Comment on the pattern of the forecasts.

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TABLE P-15 1 125 206 8 282 2 126 42 252 82 250 3 126 43 215 83 231 4 129 44 238 84 247 5 132 45 249 85 252 6 136 46 250 86 250 7 139 47 250 87 253 8 137 48 275 88 255 9 155 49 29289 236 10 144 50 3090 221 142 51 301 91 204 12 153 52 265 92 187 13 159 53 27 93 187 14 160 54 289 42 15 156 55 31995 210 16 153 56 3796 221 17 15 57 350 7 222 18 158 58378 98 236 19 150 35899 256 20 129 6 359 100 253 117 6 333 250 22 112 310 102 232 23 109 63 293 103 221 24 126 64 285 104 214 25 123 65284 105 221 26 12 283 106 225 27 123 67 2907 224 28 125 68 312 108 228 29 128 69 288 109 233 30 128 70 280110 239 31 130 71 255 111 251 32 129 72 258 112 261 33 139 73 266 113 268 34 131 74 271 114 304 35 131 75 272 115 285 36 166 76 2656 274 37 159 77 2817 281 38 163 78 294 118 259 39 158 79 300119 270 40 165 80 284 120 251 9