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# Stats Ch3 & 4

### Stats Ch3

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

Distribution | The possible values of the variable sliced into equal-width bins and gives the number of values (or counts) falling into each bin |

Histogram | A chart using adjacent bars showing distribution of a quantitative variable where each bar represents the frequency of values falling into each bin. |

Relative Histogram | A chart using adjacent bars showing distribution of a quantitative variable where each bar represents the percent of values falling into each bin. |

Gap | A region of the distribution where there are no values |

Stem-and-Leaf | A display showing quantitative data values in a way that sketches the distribution of the data |

Dotplot | A graph that shows a dot for each data value |

Shape | A description stating modes, symmetry or skewness, and outliers or gaps |

Center | A typical value of a distribution such as the mean or median |

Spread | A numerical summary of how tightly the values are clustered around the center. |

Mode | A hump or pile in the shape of a distribution of a variable |

Unimodal | A distribution having one mode |

Bimodal | A distribution having two modes |

Multimodal | A distribution having more than two modes |

Uniform | A distribution in which the height of each value is approximately the same |

Symmetric | A distribution that has, roughly, a mirror image of the other side from the center |

Tails | A part of a distribution that has fewer values and typically trails off to an end |

Skewed | A distribution that is not symmetric and has a tail that stretches out further on one side than another |

Outliers | Extreme values that do not appear to be consistent with the rest of the data |

Median | The middle value with 50% of the data below and 50% of the data above |

Range | The difference between the maximum value and the minimum value |

Quartile | The numbers that signify the 25% ,50%, and 75% division of data and divide the data into four equal parts |

Interquartile Range (IQR) | The difference between the third and first quartiles |

Percentile | The value below which a given percentage of observations in a group of observations fall |

5-Number Summary | Minimum value, lower quartile, median, upper quartile, and maximum value. |

Box Plot or Box and Whiskers Plot | A display using the 5-Number summary where the quartiles and median form a central box and whiskers are formed by connecting extrema to their nearest quartile |

Mean | Represented by a bar above the variable found by the summation of the data points divided by the data count. |

Created by:
HowardGeometry