In accordance with ISO 5725-1[1], the general term „precision“ is used to describe the proximity of a measurement to the actual value. When the term is applied to series of measurements of the same measurement, it is a component of random errors and a component of systematic errors. In this case, the veracity is the proximity of the average of a set of measurement results to the actual value and the accuracy is the agreement between a number of results. Reproducibility can be defined as the proximity of the agreement between independent results obtained with the same process on the test equipment, but under different conditions, in this case in different experiments. In the fields of science and technology, the accuracy of a measurement system is the degree of proximity of measurements from a quantity to the actual value of that quantity. [2] The accuracy of a measurement system that relates to reproducibility and repeatability is the degree to which repeated measurements under unchanged conditions show the same results. [2] [3] Although the two words are commonly synonymous with precision and precision, they are deliberately contrasted in the context of the scientific method. On the other hand, the International Bureau of Weights and Measures (BIPM) defines accuracy as the proximity of the agreement between a measured value and a real value of a measured value (quantity to be measured) [2]. In this case, veracity is defined as the match between the average of an infinite number of replicated measurement values and a reference value. Accordingly, the New Oxford American Dictionary indicates that the technical definition of accuracy is the degree to which the result of a measurement, calculation or specification corresponds to the correct value or standard [3]. In the same line, the Merriam-Webster dictionary defines accuracy as the degree to which an identification number conforms to a standard or actual value [4].

Good agreement and proximity to predicted and experimental results and high dye adsorption capacity in a short period of time confirm the high ability of the current wastewater treatment method, while a simple separation of existing nanoparticles and good regeneration support a good applicability of Fe3O4-MNPs-AC for wastewater treatment. The accuracy of the analysis method is the proximity of the match between a real value and the value obtained. ISO 5725, entitled „Truth and Accuracy) of Measurement Methods and Results, uses the combination of two terms, „truth“ and „precision“ (Figure 1), to describe the accuracy of a measurement method. According to ISO 5725, „truth“ refers to the consistency between the arithmetic average of a large number of test results and the actual or accepted baseline [1]. „Precision“ refers to the agreement between the different test results. On the military level, precision refers primarily to the accuracy of the fire (shooting accuracy), the accuracy of the fire, expressed by the proximity of a group of fire on and around the center of the target. [4] Comparing the results of the four observers simultaneously on the basis of Fleiss kappa statistics, the proximity of the agreement with MSh EST was better than with SSh EPI; No significant differences were observed in patients by primary or recurrent chole atoms and by age or sex.