Q: Consider any three-variable linear regression model:
Yt = α1 + α2X2t + α3X3t + u1t
Suppose you multiply all the X2 values by 2. What will be the effect of
this rescaling, if any, on the estimates of the parameters and their standard
Doubt: Will intercept and slope cofficients remain unaffected or get divided by 1/2 or any other answer?