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CNN.com reported on a 2005 study that ranked the world's cities in terms of how livable they are using a range of criteria related to stability, health care, culture and environment, education, and infra - structure. Vancouver came out on top. For each of the following research questions, state which non - parametric hypothesis test is appropriate. Explain your answers.

a. Which cities tend to receive higher rankings-those north or south of the equator?

b. Are the livability rankings related to a city's economic status (assessed by rank)?

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