In any equation: | |

¯x |
= mean of data set 1 |

¯x |
= mean of data set 2 |

s |
= standard deviation of data set 1 |

s |
= standard deviation of data set 2 |

n |
= number of data inset 1 |

n |
= number of data inset 2 |

(Adapted from Massart et al., 1988)