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Table 1 Calculation of error for the calibration curve (P = 0.95, t = 3.18)

From: Determination of Cu (II) ions using sodium salt of 4-phenylsemicarbazone 1,2-naphthoquinone-4-sulfonic acid in natural and industrial environments

C · 10−5, mol/L Mass m i , g Confidence interval d i Standard error (SE) of arithmetic mean S Mean square error Δ m m ± δ
1.41 0.0028 0.0001 0.0001 0.0002 0.0027 ± 0.0002
2.02 0.0027 0
2.64 0.0026 0.0001
3.29 0.0026 0.0001
  1. The arithmetic mean value of the mass is 0.0027 g