Организация статистического приемочного контроля качества продукции по количественному признаку

Solved the practical problem of the organization of quality control based on statistical data. An approach to determining the optimal number of classes for the grouping construct the distribution curves of the experimental data. The studies were conducted on the basis of statistical data for the mass of initial billet forging and stamping production. On the example of selective statistical data obtained from measurements of the initial batch of blanks built distribution curves. Guided by common methods, we determined the number of intervals for the histogram. The optimal number of classes at the grouping interval estimation avoids dips and surges in the curves due to the random nature of the sample. This helps improve the reliability of quality assessment. Each distribution curve was checked by Pearson´s chi-squared test. Recommended method of construction of the distribution curves for the most accurate assessment of the quality of the manufactured products with the general population on the machine-building enterprises in the selective control.