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Frequency Polygons definitions

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  • Frequency Polygon
    A graph displaying frequency distribution using points at class midpoints connected by segments, offering a visual alternative to histograms.
  • Histogram
    A bar graph representing frequency distribution, where bar heights correspond to class frequencies and bars touch each other.
  • Frequency Distribution
    A summary showing how data values are grouped into classes and the number of occurrences in each class.
  • Class Midpoint
    A value calculated as the average of a class's lower and upper limits, used for plotting points in frequency polygons.
  • Class Limit
    The smallest and largest values that define the boundaries of a class interval in a frequency distribution.
  • Segment
    A straight line connecting two plotted points in a frequency polygon, forming the shape of the graph.
  • Y-Axis
    The vertical axis on a graph representing frequencies, identical in both histograms and frequency polygons.
  • X-Axis
    The horizontal axis on a graph labeled with class midpoints, used for both histograms and frequency polygons.
  • Skew
    A characteristic of a distribution indicating asymmetry, determined by the direction and length of the tails relative to the peak.
  • Peak
    The highest point on a frequency polygon or histogram, representing the class with the greatest frequency.
  • Tail
    The extended portion of a frequency polygon or histogram, used to assess skewness by its length and direction.
  • Scale
    A system of marks on axes that ensures consistent measurement and comparison of frequencies across graphs.
  • Line Graph
    A graph type often confused with frequency polygons, but differs by plotting individual data points rather than class frequencies.
  • Data Interpretation
    The process of analyzing graphical representations to extract meaningful information about frequency and distribution.
  • Visualization
    The use of graphical tools like histograms and frequency polygons to represent and understand statistical data.