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In this new volume, entitled Critical Minerals of the United States, USGS geologists provide the latest and greatest on the geology and resources of 23 mineral commodities deemed critical to the economy and security of the United States. This work is meant to provide decision-makers, researchers, and economists with the tools they need to make ... Start studying FIT Level 2 Exam. Learn vocabulary, terms, and more with flashcards, games, and other study tools. Selected Critical Values of the t-Distribution A test is 2-tailed if you ask the question, 'does population 1 differ from population 2'. Then, if the mean for population 1 is significantly greater or smaller than that for population 2, you reject the null hypothesis. If you ask simply, is the true mean for population 1 greater than that for ... U.S. Geological Survey news release "Going Critical" The rare earth elements (REE) are a set of seventeen metallic elements. These include the fifteen lanthanides on the periodic table plus scandium and yttrium. Rare earth elements are an essential part of many high-tech devices. The U.S.