# Statistical significance

### From OpenToxipedia

Term | Statistical significance |
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Description | The probability that a result is not likely to be due to chance alone. |

Definition | Statistical significance
The probability that a result is not likely to be due to chance alone. By convention, a difference between two groups is usually considered statistically significant if chance could explain it only 5% of the time or less. Study design considerations may influence the a priori choice of a different level of statistical significance. The statistical significance determined by using appropriate standard techniques of statistical analysis with results interpreted at the stated confidence level and based on data relating species which are present in sufficient numbers at control areas to permit a valid statistical comparison with the areas being tested. |

References | http://www.epa.gov/iris/help_gloss.htm#r |

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