Frequency Distribution

A summary of a set of data that displays the number of observations in each of the distributions distinct categories or classes

Discrete Data

Data that can be taken on a countable number of possible values

Relative Frequency

The proportion of total observations ie frequency divided by the total frequencies

Continuous Data

Data whose possible values are uncountable and which may assume any value in an interval

Mutually exclusive classes

Classes that do not overlap so that a data value can be placed in only one class

All-Inclusive Classes

A set of classes that contains all possible data values

Equal Width Classes

The distance between the lowest possible value and the highest possible value in each class is equal for all classes

Cumulative Frequency

A summary set of data that displays the number of observations w/ values less than or equal to the upper limit of each of its classes

Cumulative Rel Frequency

A summary of a set of data that displays the proportion of observations w/ values less than or equal to the upper limit of each of its classes

Frequency Histogram

A graph of frequency distribution w/ the horizontal axis showing hte classes, the vertical axis showing the frequency count and the rectangles having a high equal to each frequency

Ogive

The graphical representation of the cumulative relative frequency; in the form of a line

Bar Chart

A graphical representation of data in a bar form

Line Chart

A two dimensional chart showing time on the horizonal axis and the variable of interest on the vertical axis

Scatter Diagram

A two dimensional graph of plotted points showing a potential trend

Dependent Variables

A variable whose values are thought to be a function of, or dependent on the values of another variable called the independent variable 

Independent Variable

A variable whose values are thought to impact the values of the dependent variable