Facts that Matter
It is a branch of science which deals with the collection, presentation, analysis and interpretation of numerical data.
Facts or numerical figures, collected with a definite purpose, are called data.
Ungrouped or raw data
The data obtained in original form are called raw data or ungrouped data.
The data condensed into groups or classes are called grouped data.
I. The arrangement of raw numerical data in ascending or descending order of magnitude, is called an array.
II. The number of times an observation occurs in the given data is called the frequency of that observation.