Table 8.
LD50, 95 % confidence intervals and regression equations of different extractives of Leeamacrophylla against Artemiasalina nauplii at 24h exposure.
| Extractives | Regression equation | LD50 (μg/mL) | 95 % Confidence interval |
χ2 value | |
|---|---|---|---|---|---|
| Lower | Upper | ||||
| Crude methanol | Y = −0.703 + 2.916X | 90.315 | 69.909 | 110.721 | 0.555 |
| Petroleum ether | Y = 1.607 + 1.146X | 913.551 | 30.491 | 1796.611 | 0.797 |
| Dia-ion resin | Y = 2.196 + 1.000X | 636.796 | −177.082 | 1450.674 | 0.552 |
Here, X is the log dose and Y is the working probit of percentage mortalities. The χ2 (chi-square) statistic depicts the difference between the observed counts and the counts expected if there were no association at all in the population. When the chi-square value is low, the correlation between two sets of data is high.