Business Data Analysis: Chapter 2
Pie Chart
A chart that shows the proportion or percentage that each class represents of the total number of frequencies.
Relative Frequency Distribution
A chart that shows the proportion or percentage that each class represents of the total number of frequencies. Divide the number of observations in a class by the total number of observations for the variable. This result will give a percent that represents the relative frequency of that class to the total.
Histogram
A graph in which the classes are marked on the horizontal axis and the class frequencies on the vertical axis. The class frequencies are represented by the heights of the bars, and the bars are drawn adjacent to each other.
Bar Chart
A graph that shows qualitative classes on the horizontal axis and the class frequencies on the vertical axis. The class frequencies are proportional to the heights of the bars.
Class
A group sharing common attributes.
Frequency Table
A grouping of qualitative data into mutually exclusive classes showing the number of observations in each class.
Frequency Distribution
A grouping of quantitative data into mutually exclusive and collectively exhaustive classes showing the number of observations in each class.
Cumulative Frequency Polygon
A type of frequency polygon that shows cumulative frequencies. In other words, the cumulative observations of each class are added on the graph from left to right.
Class Frequency
Number of observations in a class.
Frequency Polygon
Shows the shape of a distribution and is similar to a histogram. It consists of line segments connecting the points formed by the intersections of the class midpoints and the class frequencies.
Class Midpoint
The lower limit for every class is the smallest value in that class. On the other hand, the upper limit divided 2.
Class Interval
The size of each class into which a range of variable is divided.
Cumulative Frequency Distribution
The sum of the class and all classes below it in a frequency distribution.