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A systematic error in a measurement

  • A.scatters the readings randomly about the true value
  • B.arises only from mistakes made by the observer
  • C.can be reduced by averaging many readings together
  • D.shifts every reading in the same direction

Answer: D

Because it acts the same way each time, averaging does nothing at all for it, and only calibration against a standard reveals it. It is the more dangerous of the two kinds precisely because the readings look consistent.

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