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Comparison between spectrophotometric method and visual method using chi-square test
| Visual | Chi-square value | P Value | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| a1 | a2 | a3 | b1 | b2 | c4 | Total | ||||
| Spectrophotometric methods | a1 | 3 | 0 | 1 | 1 | 0 | 0 | 5 | 62.261 | 0.0001** |
| a2 | 2 | 19 | 1 | 1 | 1 | 0 | 24 | |||
| b1 | 1 | 0 | 0 | 12 | 2 | 0 | 15 | |||
| b2 | 1 | 0 | 0 | 2 | 2 | 1 | 6 | |||
| Total | 7 | 19 | 2 | 16 | 5 | 1 | 50 | |||
**P < 0.05
