Few details were released about the flight, made Saturday, but the test indicates China's ambitions to add a heavy freighter to its capabilities and match better against traditional air powers, Russia and the United States.

CNN: China's new super cargo jet takes to the skies

The question then is: when a test indicates that a patient has disease X, what are the odds that the test is correct?

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The gist is simple: it indicates how well a school has brought on pupils from one test level to another.

BBC: NEWS | UK | Education | How 'value added' works