7. When controlling the quality of the drug - metformin hydrochloride (substance) - the loss of mass m during drying was determined. The following results were obtained in five parallel determinations, % 0.10; 0.10; 0.20; 0.20; 0.30. Characterize the reproducibility of the analysis results by calculating the confidence interval m±Δm and the relative error e of the average analysis result at a confidence level P=0.95. Answer: m±Δm=(0.18±0.10)%; e=55.6%

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