Refer to Exercise 13.54.

a. Formulate a new model using a variable selection procedure with AIC and then BIC as the criterion to select the independent variables. Was there a large difference in the selected variables for the two methods?

b. Compare the standard errors of the estimated β_s in the model selected by BIC to those in the full model fit in Exercise 13.54. Was there an increase or a decrease in the standard errors of the estimated βs?

c. Produce a 95% confidence interval on the average evaporation for the values of the explanatory variables given in Exercise 13.54. Was there a large difference in the two point estimators? Compare the widths of the two intervals.

In exercise
QUESTION CONTINUE TO NEXT PAGE€¦€¦

Transcribed Image Text:

Obs 65 147 85 59 15 9540398 273 30 65 149 86 9428 345 140 34 84 66 142 83 64152 94 41 388 318 33 67 147 83 65 58 9450 406 282 26 68 167 88 69 180 9346 379 311 41 66 131 77 47 963478 446 73 66 131 8 6 159 96 72 462 294 5 75 67 134 84 68 19 95 70 464 13 20 68 161 89 7 195 9563 430 455 31 72 169 91 76 206 93 56406 604 38 88 73 178 91 76 2089455 393 610 43 74 187 94 76 2 94 51 385 520 47 88 72 171 94 75 2 9654 405 663 45 8872171 92 70 201 95 51 392 467 45 69 154 87 68 167 56448 184 11 68 149 83 68 9559 436 17710 69 160 7 66 1739542 392 173 30 70 160 87 68 7 944439276 29 70. 168 88 70 69 9548 398 72 23 67 147 83 66 170 97 60 183 16 67 166 92 67 196 9644379 76 37 89 69 171 2 72 99 94 48 393 230 50 72 180 94 72 20 48394 193 36 93 72 186 92 73 20 94 47 386 400 54 74 188 93 72 206 95473 339 44 75 199 94 72 208 9645 370 172 41 74 193 95 73 214 95 50 36 238 45 74 196 95 70 210 9645 380 118 42 96 75 198 95 207 93 40 365 93 50 76 202 95 69 202 93 39 357 269 48 73 173 96 69 173 9458 418 128 17 71 170 9 168 94 44 420 423 20 72 179 89 7 9 93 50 399 415 15 89 72 179 95 7210 98 46 389 300 42 72 182 96 73 208 943384 193 44 74 196 97 75 215 96 46 389 195 41 75 192 96 69 198 95 36 3215 49 96 75 195 95 7 6 97 24 354 185 53 76 198 94 75 211 93 43364 466 53 74 188 92 73 198 52405 399 21 2 17 19 21 24 27 35 74 178 90 74 197 956 447 232 72 175 94 70 205 9442380 275 44 92 2 190 95 7209 96 44 379 166 44 92 73 189 96 72 208 93 42 372 189 46 75 19 95 7 208 9343373 164 47 96 76 202 96 71208 94 40 368 139 50 42