D) Attributes are the characteristics of the object, levels are the values that they can have 12) When would it be appropriate to use a non-probability sampling? A) Never B) Only when probability sampling is not a viable option C) When the data set is not detailed enough D) When generalizations about large populations are not needed 13) Which of the following is a revealed preference method? A) Paired comparisons B) Hedonic C) Choice experiment D) Contingent valuation 14) What is the difference between internal and external validity? A) Internal refers to the study being conducted correctly and with a sound research design, external to the study being applicable to other contexts B) Internal refers to the correct choice of one site in the area, external to the choice of sites outside of that area C) Internal refers to using a method correctly, external to using other methods on the same data set D) Internal is about coastal areas, external about inland regions 15) Consider the maximization problem max U(X, Q) s.t. P-Xs y, Q = 00 X What is its corresponding minimization problem? A) min U(X, Q) = V(P,Q,y) Q B) min P-X 3.1. Q = Q\" P C) min P-X st. U(X, Q) 2 U0, Q = Q\" X D) min P0 3.1. v(P,Q,y) = U(X,Q) P 16) Consider the following gure, describing welfare changes corresponding to a change in a nonmarket good q: ,'(P.q, Q", U)