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# Table 1 Improvement in minimum number of nematode samples needed to achieve a 10% 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: Factors affecting success of biological agents used in controlling the plant-parasitic nematodes

Mean count per sample^{+} | Number of samples via (E) | Student’s t value | Number of samples via (D)^{++} | Improvement in sample size |
---|---|---|---|---|

Pratylenchus spp.: the power law parameters a = 1.58, b = 1.33 | ||||

1 | 158 | 2 (assumed) | 632 | 609 and 209 instead of 632 and 215 samples, respectively |

1.964 (n = 632) | 609 | |||

1.9638 (n = 609) | 609 | |||

5 | 54 | 2 (assumed) | 215 | |

1.971 (n = 215) | 209 | |||

1.971 (n = 209) | 209 | |||

M. incognita: the power law parameters a = 2.92, b = 1.47 | ||||

5 | 124 | 2 (assumed) | 498 | 480 and 375 instead of 498 and 388 samples, respectively |

1.966 (n = 498) | 480 | |||

1.965 (n = 480) | 480 | |||

8 | 97 | 2 (assumed) | 388 | |

1.966 (n = 388) | 375 | |||

1.966 (n = 375) | 375 |