Secondary data - Using data collected previously by someone else from sources such as online website and books, Primary Data  - Data collected for the first-time using tools such as interviews and survey's, Bias  - The data source is using unethical and unfair practices of getting data., Size - The sample size must be enough for the data to be valid , Reputation - The sources of data must have good reputation on relevant subjects.,

Bảng xếp hạng

Phong cách trực quan

Tùy chọn

Chuyển đổi mẫu

Bạn có muốn khôi phục tự động lưu: không?