This glossary is far from complete. We are constantly adding math terms. For instructions on adding new terms, please refer to Math Glossary Main Page
Tip: When creating a histogram...
- Leave no space between bars when the class intervals represent continuous data; bar graphs, drawn with a gap between bars, are used to represent discrete data (i.e., different categories).
- Graph the observed frequency in each class interval (also called the class frequency) for datasets with a small to medium number of observations; label the y-axis "Frequency." Graph the relative frequency in each class interval for datasets with a large number of observations; label the y-axis "Proportion" or "Relative Frequency."
A typical histogram
Pulse rates, in beats per minute, were calculated for 192 students enrolled in a statistics course at the University of Adelaide. The first step in creating a histogram is to create a frequency table.
Exploring the effect of class interval size