The major distinction between the experiments and quasi-experiments chapter and earlier chapters is the

A) frequent use of binary variables.
B) type of data analyzed and the special opportunities and challenges posed when analyzing experiments and quasi-experiments.
C) superiority of TSLS over OLS.
D) use of heteroskedasticity-robust standard errors.

Answer: B) type of data analyzed and the special opportunities and challenges posed when analyzing experiments and quasi-experiments.