Which one of the following is used primarily for information dissemination rather than training?

Statistical summaries are specifically designed to present data in a concise format that facilitates understanding and interpretation of trends and patterns. Their primary function is to provide a snapshot of data, making it easier for stakeholders to grasp important information quickly. This characteristic sets them apart from other options, which are often more detailed and can serve a training or evaluative purpose.

For instance, field reports typically provide detailed narratives about specific incidents and may include evaluative elements that contribute to training or operational insights. Incident logs serve as real-time records of events that can also be used for analysis and training purposes. Officer evaluations are comprehensive assessments that focus on individual performance and development, heavily leaning towards training and feedback.

In summary, while the other options may contain informational components, statistical summaries are specifically tailored for the purpose of disseminating information efficiently, making them the ideal choice for this question.