Independent random samples from two regions in the same area gave the following chemical measurements (ppm). Assume the population distributions of the chemical are mound-shaped and symmetric for these two regions.   Region I: ;    438 1013 1127 737 491 840 306 402 1155 1075 500 340   Region II: ;    778 464 563 610 827 894 476 394 824 387 816 767 479 710 389 826   Let  be the population mean for  and  be the population mean for . Find a 90% confidence interval for . choose one: a) –125.00 to 253.50 b) –114.49 to 242.99 c) –253.50 to 125.00 d) –248.25 to 119.75 e) –119.75 to 248.25

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