एक नमूनाकरण (सैंपलिंग) तकनीक जो जनसंख्या के भीतर सभी पहचान योग्य उपसमूहों या स्तरों का आनुपातिक प्रतिनिधित्व सुनिश्चित करती है, कहलाती है:

Which movement aimed to promote Khadi, a hand-spun and handwoven cloth native to India?

Who were prominent leaders associated with the initial phase of the Telangana Rebellion (1946-1951) against the Nizam's rule and feudal landlords?

What was the immediate trigger for the Revolt of 1857?