Question

Question 7 Independent random samples from two regions in the same area gave the following chemical measurements (ppm). Assume the popalation distributions of the chemical are mound-shaped and symmetric for these two regions Region 1,71; m1 = 12 981 726 686 496 657 627 815 504 950 605 570 520 Region I: x2 2-16 024 830 526 502 539 373 888 685 868 1093 1132 792 1081 722 1092 844 LotMg-678 be the population mean and ơ1.164 be the population standard deviation fr ,Let μ2-S12 be the population mean and-239 be the population standard deviation fr η Determine and examine the 90% confidence intenal for μ1-μ2. Does the interval consist of numbers that are all positive? all negative? cr different signs? At the 90% level of confidence, is one region more interesting that the other from a geochemical perspective? Select one a. The interval contains only negative numbers. We cannot say at the required confidence level that one region is more interesting than the other. x O b. The interval contains both positive and negative numbers We can say at the required confidence level that one region is more interesting than the other c. The interval contains only positive numbers We cannot say at the required confidence level that one region is more intcresting than the other d. The interval contain both positive and negative mumbers. We cannot say at the required confidence level that one region is more interesting than the other O O e. The interval contains only positive numbers We can say at the required confidence level that one region is more interesting than the other

Answer 1