Term

Definition
Special graphical formats used to portray a frequency distribution, including histograms, frequency polygons, and cumulative frequency polygons. Other graphical devices used to portray data are line charts, bar charts, and pie charts. 


Term

Definition
The interval in which the data are tallied. For example, $4 up to $7 up to $11 is another class. 


Term

Definition
The number of observations in each class, 16 observations in the $4 up to $6 class, 16 is the class frequency. 


Term

Definition
Each observation must fall into one of the categories. 


Term

Definition
A grouping of data into classes showing the number of observations in each of the mutually exclusive classes. 


Term

Definition
A graphical display of a frequency or relative frequency distribution. The horizontal axis shows the classes. The vertical height of adjacent bars shows the frequency or relative frequency of each class. 


Term

Definition
The value that divides the class into two equal parts. For the classes $10 up to $20 and $20 up to $30, the midpoints are $15 and $25, respectively. 


Term

Definition
A property of a set of categories such that an individual, object, or measurement is included in only one category. 


Term
Relative frequency distribution 

Definition
A frequency distribution that shows the fraction or proportion of the total observations in each class. 

