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# CH 9 Math Statistics

### math definitions

Question | Answer |
---|---|

The median of the lower half of a data set; represented by ܳQ1 | first quartile |

A measure of variation for a data set, which is the difference of the third quartile and the first quartile | interquartile range (IQR) |

The sum of the data divided by the number of data values | mean |

An average of how much data values differ from the mean | mean absolute deviation (MAD) |

A measure that describes the typical value of a data set The mean, median, and mode are all measures of center. | measure of center |

A measure that describes the spread, or distribution of a data set The range, interquartile range, and mean absolute deviation are all measures of variation | measure of variation |

For a data set with an odd number of ordered values, the median is the middle value; For a data set with an even number of ordered values, the median is the mean of the two middle values. | median |

The data value or values that occur most often; Data can have one mode, more than one mode, or no mode. | mode |

A data value that is much greater than or much less than the other values in a data set | outlier |

Values that divide a data set into four equal parts | quartiles |

The difference of the greatest value and the least value of a data set | range (of a data set) |

A question for which a variety of answers is expected; The interest is in the distribution and tendency of those answers. | statistical question |

The science of collecting, organizing, analyzing, and interpreting data | statistics |

The median of the upper half of a data set; represented by ܳQ3 | third quartile |