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Data is often measurements, which are expressed in numbers
Data that can be expressed by numbers, for example 35% or 0.23 or a quarter. The opposite is qualitive data and this would be opinions.
operational observationsquantitative observationsmanipulated observationsqualitative observations
Rational numbers can be expressed as a terminating or repeating decimal.
Rational numbers can be expressed as a ratio of two integers, irrational numbers cannot be expressed in that way.