What type of chart is commonly used to show the distribution of questionnaire results?

A vertical bar chart is an effective tool for displaying the distribution of questionnaire results because it visually represents data in a way that makes comparisons easy. Each category of responses can be represented by a separate bar, and the height of each bar indicates the frequency or number of responses in that category. This allows viewers to quickly grasp the distribution and see which responses are most or least common.

In the context of a questionnaire, where respondents may provide answers to various questions with multiple choice options or rated scales, the vertical bar chart is especially useful for summarizing data. It presents categorical data clearly and helps identify trends or patterns in the responses.

In contrast, other types of charts serve different purposes. A pie chart could show proportions of a whole but may not effectively depict small differences between categories, especially if they are numerous. A line graph is typically used for showing trends over time rather than categorically distributed data. A scatter plot is designed to show relationships between two continuous variables, making it less suitable for categorical questionnaire results. Thus, the vertical bar chart is the best choice for clearly illustrating the distribution of responses in a survey context.