mode | | a table that lists items together according to the number of times, or frequency, that the item occurs |

median | | a number line with marks or dots that show frequency |

stratified sample | | the difference between the greatest and least values in a data set |

quartile | | a graph to organize and display data so that the frequencies can be compared |

convenience sample | | a bar graph that compares two related sets of data |

histogram | | the description of the relationship between two data sets |

outlier | | a diagram that is used to show relationships between sets |

correlation | | the spread of values in a set of data |

mean | | the sum of a set of data divided by the number of items in the data set; also called average |

systematic sample | | the entire group of objects or individuals considered for a survey |

double-line graph | | a bar graph that shows the frequency of data within equal intervals |

scatter plot | | a graph that displays the highest and lowest quarters of data as whiskers, the middle two quarters of the data as a box, and the median |

double-bar graph | | a graph with points plotted to show a possinle relationship between two sets of data |

variability | | a graph that shows how two related sets of data change over time |

sample | | a sample in which each individual or object in the entire population has an equal chance of being selected |

population | | the bumber or numbers that occur most frequently in a set of data; when all bumbers occur with the same frequency, we say there is no mode |

box-and-whisker plot | | a sample that does not fairly represent the population |

frequency table | | a value much greater or much less that the others in a data set |

random sample | | a sample of a population that is made up of members that choose to be in the sample |

range | | sampling the most available subjects in the population to obtain quick results |

stem-and-leaf plot | | a part of the population |

voluntary response sample | | a sample of a population that has been selected using a pattern |

line plot | | the middle number or the mean (average) of the two middle numbers in an oredered set of data |

venn diagram | | three values, one of which is the median, that divide a data set into fouths. See also first quartile, third quartile |

biased sample | | a sample of a population that has been divided into subgroups |