Frequency polygons

Definition

Frequency polygons are graphical representations of the distribution of a dataset. They use lines to connect the midpoints of each class interval at their respective frequencies.

5 Must Know Facts For Your Next Test

1. Frequency polygons can be used to compare multiple distributions on the same graph.
2. The x-axis represents the class midpoints, while the y-axis represents the frequencies.
3. They provide a clearer view of the distribution shape compared to histograms, especially when comparing datasets.
4. To create a frequency polygon, start by plotting points for each class midpoint and its corresponding frequency, then connect these points with straight lines.
5. Frequency polygons are often used alongside histograms for better comparative analysis.

Review Questions

Related terms

Histogram:

A type of bar graph that represents the frequency distribution of a dataset using adjacent rectangles.

Class Interval: A range of values within which data points fall in grouped data representation.

Time Series Graph:

A graph that displays data points at successive time intervals, showing trends over time.