differentiate between primary and secondary data?
You can find the answer to your question at the below mentioned link.
https://www.meritnation.com/ask-answer/question/difference-between-primary-data-and-secondary-data/collection-of-data/6021010
https://www.meritnation.com/ask-answer/question/difference-between-primary-data-and-secondary-data/collection-of-data/6021010