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Continuous variables

Some examples of continuous variables are:

All continuous data need units, and observations are recorded in the desired units.

Continuous variables can take any values in intervals. For example:

Note the convention with age is that the interval is from our age in a whole number of years up to the next whole number of years. Our specification of intervals in talking about age is usually not as definite as when we quote someone's height, but the principle is the same − observations of continuous variables are never exact and correspond to intervals, no matter what the size of the interval.