Frequency Polygons Flashcards

A type of graph used to represent grouped data by plotting points at the midpoints of intervals and joining them with straight lines.

To show the distribution of data and compare different data sets.

The value halfway between the upper and lower boundaries of a class interval.

Plot points at the midpoints of each class interval against their frequencies, then join the points with straight lines.

The horizontal axis represents the midpoints of class intervals, and the vertical axis represents the frequencies.

Frequency polygons use points and lines, while histograms use bars to represent data.

Points are joined with straight lines, and the graph is not closed at the ends unless specified.

Multiple frequency polygons can be drawn on the same axes to compare data sets.

They provide a clear visual representation of trends and patterns in grouped data.

Calculate midpoints for each class interval, plot the points using frequencies, and join them with straight lines.