Analytical procedures involve evaluating financial and operational information by comparing it with expected values. These expectations can be based on historical data, industry benchmarks, budgets, or other relevant criteria. The primary purpose of analytical procedures is to identify any unusual or unexpected variations that could indicate potential issues or areas requiring further investigation.
IIA Reference:
IIA Standard 2320: Analysis and Evaluation requires internal auditors to analyze and evaluate the information gathered during an engagement. Analytical procedures are a critical part of this process, as they help auditors identify trends, anomalies, and areas of risk by comparing actual results with expectations.
The Practice Guide on Analytical Procedures defines these procedures as the analysis of relationships between different sets of data, with the goal of identifying inconsistencies or unexpected patterns.

The internal auditor has primarily obtained testimonial evidence. Testimonial evidence is derived from interviews, discussions, and responses from employees or other parties. It involves collecting and analyzing verbal information to draw conclusions, which is precisely what the auditor did by conducting interviews, documenting them, analyzing the summaries, and drawing conclusions based on this information.
References:
* IIA Standards: 2310 - Identifying Information
* IIA Practice Guide: Audit Evidence