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Frequency Polygons definitions

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  • Frequency Polygon
    A graph using points connected by segments to display frequencies across classes, offering an alternative to histograms.
  • Histogram
    A bar graph representing frequencies for class intervals, with bar heights showing the frequency of each class.
  • Frequency Distribution
    A summary table showing how data values are distributed across different classes or intervals.
  • Class Midpoint
    A value found by averaging the lower and upper limits of a class, used as the x-coordinate for plotting.
  • Class Interval
    A range of values grouped together in a frequency distribution, often defined by lower and upper limits.
  • Lower Limit
    The smallest value included in a class interval, marking its starting boundary.
  • Upper Limit
    The largest value included in a class interval, marking its ending boundary.
  • Y-Axis
    The vertical axis on a graph, representing frequencies in both histograms and frequency polygons.
  • X-Axis
    The horizontal axis on a graph, labeled with class midpoints for frequency polygons and histograms.
  • Skew
    A measure of asymmetry in a distribution, identified by the direction and length of the tails relative to the peak.
  • Peak
    The highest point on a frequency polygon or histogram, indicating the class with the greatest frequency.
  • Tail
    The extended part of a distribution on either side of the peak, used to assess skewness.
  • Segment
    A straight line connecting two plotted points on a frequency polygon, forming its shape.
  • Line Graph
    A graph connecting data points to show trends over time, often confused with frequency polygons but used differently.