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Independent random samples from two regions in the same area gave the following chemical measurements (ppm)....

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. Let u1 be the population mean for x1 and u2 be the population mean for x2 . Suppose the confidence interval for u1-u2 for a specific level of confidence is - 30.77 to 2.25. Does the interval consist of numbers that are all positive? all negative? or different signs? At the given level of confidence, is one region more interesting than the other from a geochemical perspective?

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