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Question 9 1 out of 1 pointsIndependent 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 be the population mean for and be the population mean for Suppose the confidence interval for 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?
Question 10 1 out of 1 pointsSuppose a random sample of 347 married couples found that 197 had twoor more personality preferences in common. In another random sample of 535 married couples, it was found that only 39 had no preferences in common. Let be the population proportion of all married couples who have two or more personality preferences in common. Let be the population proportion of all married couples who have no personality preferences in common. Find a 80% confidence interval for