What is a Pie Chart primarily used for?

A pie chart is primarily utilized as a graphical device for presenting data summaries that illustrate the proportionate relationships among categories. Each segment of the pie chart represents a category of data, and the size of each segment is proportional to the quantity it represents, allowing for an easy visual comparison of the different parts that make up a whole.

While a pie chart can indeed summarize qualitative data, it can also be used for discrete quantitative data, particularly when the data is divided into categorical segments. Thus, it serves to present the distribution of various segments clearly and effectively, attracting attention to how each category relates to the overall population.

In contrast, the other choices illustrate attributes or functionalities that are either too broad or unrelated to the specific use of a pie chart. For example, while a pie chart does summarize data, its primary function is not just about presenting data summaries but distinctly about showing proportions among categories. Similarly, it is not primarily intended to display data in a sequence, as its design does not lend itself to illustrating time series or ordered data. Lastly, while qualitative data can be presented using pie charts, the correct description emphasizes its general application as a graphical representation of categorical data summaries, not exclusively of qualitative types.