The statistical model indicates that daily sales have a direct relationship with the cost of ingredients used and an inverse relationship with rainy days.
* Option A: On a rainy day, if total sales are greater than expected compared to the cost of ingredients used, it may indicate discrepancies that could be a sign of employee theft. For instance, if ingredients are used but not reflected in the sales, it suggests that items might be missing (stolen).
* Option B: On a sunny day, lower-than-expected sales compared to the cost of ingredients could indicate wastage but not necessarily theft.
* Option C and D: Both scenarios where total sales and the cost of ingredients are higher or lower than expected do not specifically point to theft without additional context.

The primary purpose of financial statement audit engagements is to review financial reports and ensure they comply with generally accepted accounting principles (GAAP). This involves verifying the accuracy and fairness of the financial statements, ensuring they provide a true and fair view of the organization's financial position and performance. References: = IIA Practice Guide: "Auditing Financial Statements" and IIA Standard 2110.A1.

To obtain a responsive action plan from management, the auditor is most likely to achieve this when both parties agree on the "Effect" attribute of the audit finding. The "Effect" refers to the impact or potential impact of the identified issue on the organization's operations, objectives, or risk profile. When management and the auditor agree on the significance and consequences of the finding, there is a shared understanding of the urgency and importance of addressing the issue. This alignment increases the likelihood that management will develop and commit to an effective action plan to remediate the finding.
IIA Practice Guide: "Formulating and Expressing Internal Audit Opinions" COSO Internal Control - Integrated Framework

Developing a tracking system to monitor the status of engagement recommendations ensures that the chief audit executive (CAE) can systematically track the progress and implementation of corrective actions. This approach provides continuous assurance that recommendations are being acted upon and allows the CAE to identify and address any delays or issues in the implementation process. It is a proactive strategy that enables regular follow-ups and reporting to senior management, thus maintaining accountability and transparency.
The Institute of Internal Auditors (IIA) - Standards for the Professional Practice of Internal Auditing, Standard
2500 - Monitoring Progress

According to the IIA Standards, the primary factors in determining the adequacy of an annual audit plan include sufficiency, appropriateness, and effective deployment of resources. These elements ensure that the internal audit activity can effectively cover key risk areas, provide relevant assurance, and utilize resources efficiently. While cost-effectiveness is important, it is considered less critical compared to ensuring the audit plan is comprehensive and appropriately targeted. References: = IIA Standard 2010 - Planning.