The value for which P = 0.05, or 1 in 20, is 1'96 or nearly 2; it is convenient to take this point as a limit in judging whether a deviation is to be considered significant or not. Deviations exceeding twice the standard deviation are thus formally regarded as significant.

# Convenient p=0.05

Author | |

Year | 1950 |

Source | Statistical Methods for Research Workers |

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