Which of the following is an example of unstructured data?

Unstructured data refers to information that does not have a predefined data model or is not organized in a predefined manner. It often comes in formats that are not easily searchable or analyzable using traditional data-processing methods. A dictated report is a clear example of unstructured data because it typically includes freeform text, narratives, and potentially varying formats that are dependent on the individual who dictated the report. This form of data comprises rich, qualitative information but lacks the standardized structure that would allow for easy extraction and analysis.

In contrast, an EHR database, while it may contain various types of data, typically organizes patient information in a structured format, making it easier to query and analyze. A structured questionnaire collects responses in a predefined format, which means the data collected is organized and easily quantifiable. Statistical analysis relies on structured data to derive insights, meaning it similarly functions within a defined structure. Therefore, the dictated report stands out as the correct example of unstructured data.