Ranking PhD programs in economics. Refer to the Southern Economic Journal (April 2008) rankings of 129 PhD programs in economics, Exercise 2.105 (p. 93). Recall that the number of publications published by faculty teaching in the PhD program and the quality of the publications were used to develop an overall productivity score for each PhD program. The next table gives the z-scores for the 10 PhD programs that specialize in agricultural and natural resource economics. Assume these 10 programs represent a random sample of all PhD programs that specialize in agricultural and natural resource economics. Give your opinion on whether the median productivity z-score of all such PhD programs differs from 0. Test using a = .05. School z-Score 1 North Carolina State 0.37 2 Iowa State 0.35 3 Wyoming -0.30 4 SUNY Binghamton -0.48 5 Tulane -0.65 6 Hawaii, Manoa -0.69 7 New Mexico -0.71 8 Rhode Island -0.72 9 Utah State -0.73 10 Colorado School of Mines -0.76 Source: From Southern Economic Journal. Published by Southern Economic Journal © 2009