Common problems of standardized testing：

1. How are the standards for product quality inspection defined?

Product quality standard is the technical basis of product production, inspection and quality assessment. Product quality characteristics are generally expressed quantitatively, such as strength, hardness, chemical composition, etc. For those difficult to directly quantify, such as comfort, sensitivity, easy operation, etc., a number of technical parameters are determined through the test and research of products and parts to indirectly reflect the quality characteristics of products quantitatively. For enterprises, in order to enable production and operation to proceed in an orderly manner, all aspects from raw materials into the factory to product sales must be guaranteed by corresponding standards. It includes not only technical standards, but also management standards to ensure the coordination of activities. The standard based on product quality inspection is your product execution standard, or the national standard (or industry standard, local standard, enterprise standard) of the product.

2. Why does the test report indicate "only responsible for incoming samples"?？

The role and significance of "only responsible for the sample"

Some consumers often regard the inspection agency as the agency of the quality supervision department, and always hope that the inspection agency should have a clear conclusion on the quality of the product, not just the judgment of the sample. They think that products can be judged by random sampling in the same batch of products, that is, samples are representative of (or equivalent to) products, in fact, this is caused by misunderstanding and misapplication of the law of large data in statistical theory. In fact, the same batch is a special word for manufacturing enterprises to facilitate statistics and management, that is, products produced in many of the same environment, it cannot guarantee that the product quality characteristic values in the same batch of products are the same, and random sampling is just a sampling method that eliminates human factors and has a certain probability of acquisition, not a sample is equal to the product conditions and methods. Using random sampling in the same batch of products to prove that the sample is equivalent to the product is a kind of stealthing technique, a typical behavior of blind people. Therefore, the inspection agency has a clear understanding of this point and cannot be swayed by these wrong perceptions. It shows that "only responsible for the samples" not only tells the client the nature of the inspection work, but also expresses sufficient confidence in the data obtained by the inspection, and also popularizes the knowledge of spot check control theory, so that consumers and clients can understand the rigor and science of the inspection institution.