Final answer:
The numerical summary used for categorical (qualitative) data is called frequency distribution. It summarizes the data by counting the number of occurrences of each category. Pie charts can also be used to visually represent categorical data.
Step-by-step explanation:
The numerical summary used for categorical (qualitative) data is called frequency distribution. Frequency distribution summarizes the data by counting the number of occurrences of each category. It provides information about the distribution of the categories and can be presented in a table or a bar graph.
For example, let's say we have a survey asking people to choose their favorite color: red, blue, or green. We can create a frequency distribution table that shows the number of people who chose each color.
Another way to summarize categorical data is by using a pie chart. Pie chart visually represents the proportions of different categories in the data, which can help in comparing the sizes of different categories.