A variable that is both (1) mutually exclusive, (2) exhaustive, (3) has a rank order AND (4) has equal distance between categories (i.e., usually continuous variables without a true zero like Fahrenheit temperature readings -- the difference between 18 & 19 is the same as between 75 and 76) are called _______________ variables.
a) interval
b) ordinal
c) nominal
d) ratio

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