Question: A database contains sample data on commercial properties in a large city. One variable available for those properties is a quality ranking into one of

A database contains sample data on commercial properties in a large city. One variable available for those properties is a “quality” ranking into one of six categories, with 1 as the “best” and 6 as the “worst.” A realtor wanted to know how that quality index related to the “extras” available, such as food service on site, an atrium, or a fitness centre. He grouped the properties into two categories: those that had at least one of these extras and those that had no extras. How can he use a nonparametric method to compare the quality rankings of the two groups?

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