India’s first pure green hydrogen plant commissioned

Which of the following conditions is not necessary for ordinary least squares to be the best unbiased linear estimator (BLUE)? 

Let X and Y be two related variables. The two regression lines are given by x-y+1=0 and 2x-y+4=0. The two regression lines pass through the point:

Of 10 computer chips, 4 are defective. What is the probability of selecting 3 without replacement, only one of which is defective?

According to the Taylor principle, for inflation to be stable, the central bank must respond to an