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# Math Vocab Quiz

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

Q1 First Quartile Lower Quartile | The median of the lower(first)half of a data set. |

5-point summary | The lower extreme value The first quartile The Median The third quartile The upper extreme value |

biased sample | A sample in which members are not randomly selected |

box plot (box-and-whisker-plot) | A graphical display of the five point summary |

inference | a conclusion about a population made by projecting the results or a representative sample onto the whole population |

interquartile range | The difference between Q3 and Q1 |

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

Q2 Median Second Quartile | The middle value of a data set |

MAD | The average distance of the data values from the Mean |

measure of variation | How the data varies between quartiles and other important data points. 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 greatest value minus the least value in a data set |

sample | a set of data taken from a population |

sample size | The number of members in a sample |

Q3 Upper Quartile Third Quartile | The median of the upper(second)half of a data set |

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

stem | all digits except for the one of the 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 is displayed on the right and the other digits in the left |

stratified random sampling | a sampling method in which the population is divided into non overlapping 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 |

unbiased sample | same as a random same |

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smartie38942