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# Carnegie Chapter 15

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

bar graph | a way of displaying categorical data by using either horizontal or vertical bars on a graph. The height or length of each bar indicates the value for that category. |

categorical data | Data for which each piece of data fits into exactly one of several different groups, also called "qualitative" data. |

circle graph | A graph that shows how parts of the whole relate to the whole, and how parts of the whole relate to other parts. |

Clusters | Areas of the graph where data are grouped close together. |

continuous data | When quantitative data are a measurement of something and can have values that are between two counting numbers. |

Data | the facts or numbers that describe the results of an experiment or survey |

data analysis | Asking statistical questions and collecting, organizing, and analyzing data |

discrete data | When quantitative data are a count of how many, can only have values that are counting numbers (0, 1, 2, 3,...). |

distribution | The overall shape of a graph. |

dot plot | (sometimes called a line plot) is a graph that shows how the discrete data is graphed using a number line. |

double bar graph | is used when each category contains two different data sets. |

Experiment | Whenever you have a question and you collect the data to answer it by performing a test for which you decide the conditions. |

Frequency | The number of times an item or number occurs in a data set. |

frequency table | A table used to organize data according to how many times a data value occurs. |

Gaps | areas of the graph where there are no data |

Histogram | A graphical way to display quantitative or numerical data using vertical bars. The width of a bar represents an interval of data and is often referred to as a bin. |

Key | explains how each data set is represented by a color or a pattern in the graph. |

Parameter | A characteristic of a population. |

Population | An entire set of items from which data can be collected. |

quantitative data | data for which each piece of data can be placed on a numerical scale, also called "numerical" data. |

Sample | a selection from a population. |

skewed left | The peak of the data is to the right side of the graph. There are only a few data points to the left side of the graph. |

skewed right | The peak of the data is to the left side of the graph. There are only a few data points to the right side of the graph. |

stacked bar graph | A graph that stacks the frequencies of two different groups for a given category on top of one another so that you can compare the parts to the whole. |

Statistic | A characteristic of a sample. |

statistical question | a question about a population or a sample. |

Survey | A method for collecting information by asking statistical questions. |

Symmetric | The left and right halves of the graph are mirror images of each other. There is often a "peak" in the middle of the graph indicating there are many data values in the center of the graph. |

side-by-side stem-and-leaf plot | A graph that allows a comparison of the two data sets in two columns. |

stem-and-leaf plot | A graphical method used to represent ordered numerical data. |