srjebmSRJEBMSRJEBM2788-950510.47310/srjebm.2024.v04i01.002The Effect of Quantitative Measurement of Risks of Material Misstatement on the Efficiency of Determining Audit Sample Sizes: An Applied StudyAhmedSTarkhHamzaN.Al-JumailiThabitHThabitCollege of Administration and Economics, University of Fallujah, Iraq, 31002College of Electronics Engineering, University of Mosul, Iraq, 41002The study aims to test the effect of quantitative measurement of the risks of fundamental errors on the efficiency of determining the sizes of audit samples, in addition to demonstrating the significant differences in the extent of essential procedures resulting from the two methods of measuring the risks of Fundamental errors (qualitative and quantitative), as the researchers followed a series of methodological steps to achieve the objectives of the study, through the application of quantitative measurement and then statistical inspection on a sample of audit contracts that included five sectors (industrial, commercial, service, banking, and insurance) that were audited by an auditing company. The study reached a set of results, the most important of which was that the use of quantitative measurement of the risks of fundamental errors affects the efficiency of determining the sizes of audit samples by determining the appropriate size for the extent of essential procedures that works to achieves a balance between the efficiency and effectiveness of the audit process. The results of the study also showed that the use of quantitative measurement Then the statistical inspection works to rationalize the auditor's professional judgment and is not considered a substitute for it, as it appeared the importance of relying on the auditor's professional judgment in several aspects of statistical sampling planning and application.