Refer to the Southern Economic Journal (Apr. 2008) study of Ph.D. programs in economics, Exercise. The authors also made the following observation: “A noticeable feature of this skewness is that distinction between schools diminishes as the rank declines. For example, the top-ranked school, Harvard, has a z -score of 5.08, and the fifth-ranked school, Yale, has a z -score of 2.18, a substantial difference. However, . .. the 70th-ranked school, the University of Massachusetts, has a z -score of −0.43, and the 80th-ranked school, the University of Delaware, has a z-score of – 0.50, a very small difference. [Consequently] the ordinal rankings presented in much of the literature that ranks economics departments miss the fact that below a relatively small group of top programs, the differences in [overall] productivity become fairly small.” Do you agree?
Answer to relevant QuestionsWith mound-shaped data, what proportion of the measurements have z-scores between –3 and 3? Refer to the data on sanitation levels of cruise ships, presented in Exercise. These data are saved in the SHIPSANIT file. a. Use the box plot method to detect any outliers in the data. b. Use the z-score method to detect ...Refer to the American Journal of Physics (June 2010) study of sound waves in a spherical cavity, Exercise. The frequencies of sound waves (estimated using a mathematical formula) resulting from the first 24 resonances ...The Condor (May 1995) published a study of competition for nest holes among collared flycatchers, a bird species. The authors collected the data for the study by periodically inspecting nest boxes located on the island of ...US News & World Report reported on many factors contributing to the breakdown of public education. One study mentioned in the article found that over 90% of the nation’s school districts reported that their students were ...
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