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Independent random samples from two regions in the same area gave the following chemical measurements (ppm). Assume the population distributions of the chemical are

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: x1; n =12 438 1013 1127 737 491 840 306 402 1155 1075 500 340 Region II: x2; 2=16 778 464 563 610 827 894 476 394 824 387 816 767 479 710 389 826 Let be the population mean for and 2 be the population mean for x2. Find a 90% confidence interval for 1-2.

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