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help for zdemo
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Display Z distribution with vertical lines
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 zdemo z1 z2 ...

Description
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zdemo displays a standard normal distribution with
        vertical lines at z1 z2 ...

Examples
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 . zdemo 1.25
 . zdemo -1 0 +1 2 -2

Author
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      Philip B. Ender
      Statistical Computing and Consulting
      UCLA Academic Technology Services
      enderatucla.edu