Problem 1.3.9
Zip Code is a Nominal variable.
- Used to identify an object/grade (in this case, a region)
- Even though it is a number, the number only identifies the group
- Could easily use letters as a Zip Code: 1AB3E instead of 11235
- There is no natural order (a Zip Code of 24667 is not “higher” than 23532) - You can rearrange them and it won’t change the meaning
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