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You often use them to rank or order things. Most ordinal numbers end with a 'th' sound, like 'fourth' or 'fifth'. However, they can also end with a 'st', 'nd' or 'rd'. You can write ordinal ...

This test is appropriate for a contingency table where one variable has two levels and the other variable is ordinal. The two-level variable represents the response, and the other variable represents ...