A Simple Spectrophotometric Method for Determination of Glyoxylic Acid in Its Synthesis Mixture

Table 3

Statistical comparison between spectrophotometric and HPLC methods (continued).

Method	F-test calculated	F-test critical	t-test calculated	t-test critical
Spectrophotometric	12	19	1.35	4.3
HPLC

F- and t-tests were calculated using measurement data of 0.35 M GA concentration, with 2 degrees of freedom, and 95% confidence level for both series. According to statistical tables given in [28].