Table 1 Optimum nematode sample size needed to achieve a 25% level of reliability as defined in terms of standard error to mean ratio (E) or confidence interval half-width to mean ratio (D) with iteration
From: Nematode spatial distribution in the service of biological pest control
Mean count per sample | Number of samples via E | Student’s t value | Number of samples via D | References |
|---|---|---|---|---|
Criconemella spp.: The power law parameters a = 3.076, b = 1.218 | ||||
10 | 8 | 2 (assumed) | 33 | Abd-Elgawad and Hasabo (1995) |
2.037 (n = 33) | 34 | |||
2.035 (n = 34) | 34 | |||
100 | 1 | 2 (assumed) | 5 | |
2.776 (n = 5) | 10 | |||
2.262 (n = 10) | 7 | |||
2.447 (n = 7) | 8 | |||
2.365 (n = 8) | 8 | |||
Meloidogyne incognita: The power law parameters a = 4.77, b = 2.12 | ||||
10 | 101 | 2 (assumed) | 402 | McSorley et al. (1985) |
1.966 (n = 402) | 389 | |||
1.966 (n = 389) | 389 | |||
5 | 93 | 2 (assumed) | 370 | |
1.966 (n = 370) | 358 | |||
1.967 (n = 358) | 358 | |||