When preparing and delivering a presentation, including some statistical information is very crucial as it enhances the presentation's credibility and persuasiveness. Some of the reasons why you should include some statistical information in your presentation are;it helps to add credibility to your presentation, making it more persuasive, it provides support for your main points, it helps to make your argument more compelling and memorable, it also adds a level of professionalism and authority to your presentation.However, there are situations where including statistical information is not appropriate. One of the reasons which are not a reason you should include some statistical information in your presentation is; when the audience does not require statistical information, or the information is not relevant to your presentation or topic. In such cases, presenting statistics can bore the audience and cause them to lose interest in the presentation.Another reason to avoid including statistical information in your presentation is when you have limited time. If you only have a few minutes to present, then it may not be practical to include statistical information as it can take up a significant amount of your time. Therefore, it is important to use statistics only when they are relevant and necessary to make a point. In conclusion, one should only include statistics when it adds value to the presentation.