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Buy here:https://www.homeworkmarket.com/questions/stat200-final-exam-spring-2019 Solution 1 Answer: (a) (ii) Density of people per square kilometer (b) (i) All countries in the world Justification for (a) and (b): (a) The variable is the “what” more so the measurement or observation of the individual. In this case, the “what” we are looking for is the density of people per square kilometer.