30. Solving a chemistry problem

11. When controlling the quality of the drug piracetam (substance) by high performance liquid chromatography (HPLC), the content of the main substance (piracetam) W (mass fraction) was found to be equal,%: 98.9;99.1;99.4;99.5; 99.7. The true value of the content of piracetam in the preparation is Mu=99.3%. Calculate the confidence interval for the average result of the analysis with a confidence probability P=0.95. Does the true value of the content of piracetam fit into this interval? If the true value is outside the confidence interval of the mean, find what the relative systematic error of b is. Answer W±ΔW=(99.3±0.4)%. The true value of 99.3% is within the confidence interval of the mean; there is no systematic error. The method gives correct results.