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HYPOTHESIS: A reasonable proposition about the workings of the world that's inspired or implied by a theory and which may or may not be true. An hypothesis is essentially a prediction made by a theory that can be compared with observations in the real world. Hypotheses usually take the form: "If A, the also B." The essence of the scientific method is to test, or verify, hypotheses against real world data. If supported by data over and over again, hypotheses become principles.
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ARC ELASTICITY The average elasticity for discrete changes in two variables. The distinguishing characteristic of arc elasticity is that percentage changes are calculated based on the average of initial and ending values of each variable, rather than initial values. Arc elasticity is generally calculated using the midpoint elasticity formula. The contrast to arc elasticity is point elasticity. For infinitesimally small changes in two variables, arc elasticity is the same as point elasticity.
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In 1914, Ford paid workers who were age 22 or older $5 per day -- double the average wage offered by other car factories.
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"Aerodynamically, the bumblebee shouldn't be able to fly, but the bumblebee doesn't know it so it goes on flying anyway. " -- Mary Kay Ash, entrepreneur
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HDI
Human Development Index
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