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The page below is a sample from the LabCE course Quality Control. Access the complete course and earn ASCLS P.A.C.E.-approved continuing education credits by subscribing online.

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Standard Deviation

  • In the illustration, you'll note that the curve is divided into eight equal sections.
  • Each of these sections is one standard deviation or SD. In the middle of these eight sections is a line that represents the mean.
  • The illustrated Gaussian curve shows a normal distribution, which means that most of the data are close to the mean with very few of the data points being at one extreme or the other.