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Variables or data associated with numerical observations are called quantitative variables or quantitative data.
Variables or data associated with non-numerical observations are qualitative or qualitative data.
A variable that can take any value in a given range is a continuous variable.
A variable that can take only specific values in a given range is a discrete variable.
When data is presented in a grouped frequency table, the specific data values are not shown. The groups are more commonly known as classes.