Normal Distribution - PowerPoint PPT Presentation

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Normal Distribution

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Normal Distribution When large, random sets of data are collected and displayed in a histogram the histogram will be symmetrical and the frequency polygon appears as ... – PowerPoint PPT presentation

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Title: Normal Distribution


1
Normal Distribution
  • When large, random sets of data are collected and
    displayed in a histogram the histogram will be
    symmetrical and the frequency polygon appears as
    a bell shaped curve (if joined with curved lines)
    called a normal curve.
  • A graph like that demonstrates the data has -
    normal distribution.

2
  • normal distribution the type of distribution
    that usually results from a large, random set of
    data that has the following characteristics
  • the majority of the data is in the middle
  • the data is distributed symmetrically around the
    middle in the histogram
  • the frequency polygon forms a bell shaped curve
    called the normal curve
  • the averages are the same or close and near the
    middle of the set
  • there are few, if any, outliers
  • 68 of the data is within 1 standard deviation
  • 95 of the data is within 2 standard deviations
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