एक अवांछित या बाहरी चर (extraneous variable) जो एक प्रयोगात्मक अध्ययन में व्यवस्थित त्रुटि पैदा करता है, उसे किस रूप में भी जाना जाता है?

The arrival of which commission in India triggered widespread protests, including mass hartals across the country in 1928?

Which of the following leaders was instrumental in initiating and leading India’s struggle for independence?