In which of the following sampling methods are the individuals of a population subdivided into mutually exclusive and collectively exhaustive separate subpopulations with a common characteristic?
A) cluster sampling
B) simple random sampling
C) stratified sampling
D) systematic sampling
Question 2
Which of the following will lead to the least squares estimates being biased?
A) exclusion of a relevant variable
B) heteroscedasticity
C) autocorrelated error terms
D) multicollinearity