Final answer:
The best guiding principle for data representation in a presentation is choosing the right type of visual, such as a pie graph or bar graph, based on the message intended. Highlight the correct features for each and ensure the visuals are accurate and accessible.
Step-by-step explanation:
When it comes to representing data in a presentation, the best guiding principle is to select a visualization method that most effectively communicates the data to the audience. A pie graph is appropriate when you want to show how individual parts make up a whole, like the percentage of students by department in a college. Bar graphs, on the other hand, are more suitable for comparing quantities across different categories, such as the number of students enrolled in each department. Each type of graph has specific features to highlight; for a pie graph, you would point out the size of the slices in relation to one another, while for a bar graph, you would focus on the height or length of the bars as a measure of comparison.
Potential display problems such as misleading scales, non-standard divisions, or an unclear legend should be checked and avoided to ensure accuracy and readability. Consistency is crucial for visual style, including font, colors, and backgrounds. Moreover, it's important to consider accessibility, such as providing alternatives for audience members with visual or auditory impairments. You should also consider whether the use of additional media, like photographs, charts, or video, will enhance your report and make the data clearer or more impactful for your audience.