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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].
