l ncorrect Question 8 0'" 1 P15 Independent random samples from two regions in the same area gave the following chemical measurements lppml. Assume the population distributions of the chemical are mound-shaped and symmetric for these two regions. Region I: xii \"1 =12 336 500 643 767 700 4-74 1079 654 843 529 745 714 Region II: X2 :\"2 :15 707 701 604 824 754 937 730 326 394 1007 714 1021 967 742 603 4-84 Determine and examine the 90% condence interval for 11 I12 . Does the interval consist of numbers that are all positive? all negative? or different signs? At the 90% level of condence, is one region more interesting than the other from a geochemical perspective? The interval contains only positive numbers. We cannot say at the required condence level that one region is more interesting than the other The Interval contains only po5itive numbers. We can say atthe reouirecl condence level that one region is more intereshnig than the other. The interval contains both positive and negative numbers. We cannot say at the- require-cl confidence level that one region is more interesting than the- other. 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, I The interval contains only negative numbers. We can say at the required condence level that one region is more interesting than the other