Let θ̂1 and θ̂2 be unbiased estimators of θ. I. Lower variance implies higher efficiency. II. Consistency implies unbiasedness. III. An estimator can be unbiased but inconsistent. IV. Mean squared error equals variance for unbiased estimators. Which of the statements given above are correct?

Which Indian independence movement leader was primarily known for his philosophy and practice of non-violent civil disobedience?

Who gave the call for 'Do or Die' during the Quit India Movement in 1942?

Which of the following revolutionary pairs were imprisoned together in Cellular Jail and faced harsh conditions, contributing significantly to the Indian independence movement?