The four most common representations of categorical variables are:
- Frequency Distribution Tables
- Bar Charts
- Pie Charts
- Pareto Diagrams
Finding intervals
The formula for this is:
(largest number – smallest number) / number of desired intervals
It’s a good idea to round them up if provided a decimal. After this the objective is to figure out how many times the frequency occurs in the data set provided.
The relative frequency is the frequency of a given interval as part of the total:
Relative Frequency = Frequency / Total Frequency
This can later be applied to the Histogram is the information holds a continuity, as opposed to the bar chart that shows different categories.
The scatter plot is able to find outliners, or cluster data between two variables.