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

Letbe the population mean forandbe the population mean for. Find a 90% confidence interval for.

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Independent random samples from two regions in the same arca gave the following chemical measurements ( pom ) . Assume the population distributions of the chemical are mound - shaped and symmetric for these two regions Region 1 21 1 = 1 438 1013 1127 737 491 840 306 402 155 1075 500 340 Region 1 : 721 12 = 1 178 464 563 610 827 894 476 394 824 387 816 767 479 710 389 826 Let My be the population mean for and 12 be the population mean for 72 . Find a 90% confidence interval for fly - 4