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# Math Vocab

### Chapter 9 Vocab

Term | Definition |
---|---|

5 point summary | Consists of 5 data values, lower extreme, upper extreme, lower quartile, upper quartile, and median |

Biased Sample | A sample in which members are not randomly selected |

Box Plot | A graphical display of a 5 point summary ( uses 5 data values) |

Box and Whisker Plot | A graphical display of a 5 point summary |

First Quartile | Also known as the lower quartile. It is the median of the lower half of the data set |

Interquartile Range | Difference between the first and the third quartile |

Leaf | The least digit in each item of the data set, when displayed in a stem and leaf plot. |

Lower Quartile | The median of the lower half of a data set. 25% of the data fall on or below this value |

Mean Absolute Deviation | The average distance of each item of data from the mean |

Measure of variation | A measure of the spread of data from a measure of center |

population | all the members or objects about which you want information |

random sample | a set of data randomly selected from a population so that every member of the population has an equal chance of being selected |

range | The difference between the greatest and the least values in a data set |

sample | a set of data taken from a population |

sample size | the number of members in a sample |

second quartile | the median of a data set. 50% of the data fall on or below this value |

simple random sampling | a sampling method in which every member of a population has an equal chance of being selected |

stem | all digits except the one of least place value in an item of data displayed in a stem and leaf plot |

stem and leaf plot | a two column graphical display in which the least digit of each item of data is displayed in the right column and the other digits in the left column |

stratified random sampling | a sampling method in which the population is divided into nonoverlapping groups from which members are randomly selected |

systematic random sampling | a sampling method in which the first member is randomly selected, and the subsequent members are selected at regular intervals |

third quartile | the median of the upper half of a data set, also known as the upper quartile. 75% of the data fall on or below this value |

unbiased sample | a set of data randomly selected from a population so that every member of the population has an equal chance of being selected |

upper quartile | the value in a data set that 75% of the data fall on or below this value also known as quartile 3 |