Class 9 Maths Statistics Primary & secondary Data

Primary & secondary Data:

When the information was collected by the investigator herself or himself with a definite objective in her or his mind, the data obtained is called primary data. Eg: Collecting Age of students in your class

 

When the information was gathered from a source which already had the information stored, the data obtained is called secondary data.  Eg: Collecting population of all countries in the world.

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