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A bi-conditional statement is one which says that if any one of two statements is true, the other is true, too. It generally takes the form, X is true if and only if Y is true, or X is equivalent to Y, where X and Y are simpler statements.
Any two prime numbers are relatively be prime?
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it depends
No. When a scale has a true zero it is called a ratio scale. Examples are age, income, etc. In a nominal scale values are simply labels. For example, gender, colours, etc. We may code these with numbers but the numbers have no inherent meaning and the values chosen do not imply any ordering.