|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.