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# Quiz2 Vocabulary

### Terrell-QUIZ2: Terms to study from the end of the Patterns unit and Statistics.

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

FACTORIAL | The process of multiplying a number by all of the counting numbers before it. Symbol: n! | 5! = 5 x 4 x 3 x 2 x 1 |

COUNTING NUMBERS | The set of all non-partial numbers, not including 0. | 6, 21, 1,000,000, 5 |

MEASURES OF CENTRAL TENDENCY (a.k.a. centers of data) | Numbers that can be used to represent a group of data. | mean, median, mode |

MEAN | The average of all the numbers in a set of data. (i.e. The sum of items in a data set divided by the number of data items.) | For {1, 2, 3, 4, 5}: (1+2+3+4+5)/5 = 3; 3 is the mean |

MEDIAN | The middle number (or the average of the two middle numbers) of a set of data when the numbers are listed in order. | For {1, 2, 3, 4, 5}: 3 is in the middle, so it is the median. For {1, 2, 3, 4, 5, 6}: 3 and 4 are in the middle, (3 + 4)/2 = 3.5, so 3.5 is the median. |

MODE | The number in a set of data that occurs the most often in a data set. | For {1, 2, 3, 3, 3, 4, 5}: 3 is the mode because it occurs the most often. |

MEASURES OF SPREAD | Numbers that show how a group of data is distributed. | range, five-number summary, interquartile range |

RANGE | The difference between the highest and lowest numbers of a set of data. | For {1, 2, 3, 4, 5}: 1 is the lowest number, 5 is the highest number, 5-1 = 4, so 4 is the range. |

FIVE-NUMBER SUMMARY | A list of the five numbers that separate a set of data into four equal groups (quarters). These numbers are the low, first quartile, median (second quartile), third quartile, and high. | For {1, 2, 3, 4, 5, 6, 7, 8, 9, 10}: 1 = low, 10 = high, (5+6)/2 = 5.5, so 5.5 = median. To the left of 5.5 are 5 numbers, 3 is in the middle, so 3 = 1st quartile. To the right of 5.5, 8 is in the middle, so 8 = 3rd quartile. FNS = 1, 3, 5.5, 8, 10 |

DISPLAYS OF DATA | Pictures that can be used to organize and represent a group of data. | bar chart, scatter plot, line graph, box-and-whisker plot |

HISTOGRAM | A bar chart in which the bars represent specific intervals of data. It displays frequency (how often things occur)! | Can't draw pictures with this program. See your notes. (You must label the axes.) |

LINE PLOT (a.k.a. dotplot) | A diagram showing the frequency of data on a number line. | Can't draw pictures with this program. See your notes. |

STEM-AND-LEAF PLOT | A table that orders and categorizes a set of data by units of 10. | Can't draw pictures with this program. See your notes. (You must include a legend.) |

BOX-AND-WHISKER PLOT (a.k.a. boxplot) | A graph that uses a box to represent the middle 50% of a data set and segments to represent the first and last quarters of the set (i.e. a diagram of the five-number summary). | Can't draw pictures with this program. See your notes. (You must label the graph for either the five-number summary or quarters.) |