30. Solving a chemistry problem

5. When controlling the quality of a liquid drug - ethyl ester of a-bromoisovaleric acid (substance) - by the refractometric method, the following results were obtained for the refractive index n in five parallel measurements: 1.4493; 1.4494; 1.4497; 1.4499; 1.4500. Characterize the reproducibility of the obtained data by calculating the confidence interval of the mean n±Δn and the relative error e of the mean result at a confidence level P=0.95. Answer: n±Δn=1.4497±0.0004; e=0.03%