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# Statistics

### Vocabulary for Statistics Unit Grade 7

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

Absolute Deviation | The distance a number is from a given point. |

Biased Sampling | A sampling that is not representative of a population because one or more parts of the population are favored over others. |

Box Plot | A data display that shows the distribution of a set of data in four quartiles. |

Dot Plot | A data display that not only shows the distribution or spread of data, but also shows the frequency of the data values. |

Frequency | A term used to describe how often something happens or appears. |

Inference | An implied conclusion about something. |

Interquartile Range | The difference between the upper and lower quartiles of a set of data. |

Lower Quartile | The median of the lower half of a data set; also called the first quartile. |

Lower Extreme | The lowest value in a data set; also called the minimum. |

Mean Absolute Deviation | The average distance that data points are from the mean of a data set. |

Measures of Center | The measures of the average or typical value of a data set. |

Measures of Variability | The measures of the distribution or spread of a data set. |

Mean | A measure of center that is found by taking the sum of all the data and dividing it by the number of values in the set of data. |

Median | The middle value of a set of data when the values are in numerical order. |

Mode | The most repeated value or values in a set of data. |

Outlier | A data value that is extremely "far off" from the majority of the data. |

Population | An entire group of people or objects. |

Random Sampling | A sampling where each member of the population is equally likely to be selected. |

Range | The difference between the highest and lowest values in a data set. |

Sample | A part of a population. |

Upper Extreme | The highest value in a data set; also called the maximum. |

Upper Quartile | The median of the upper half of a data set; also called the third quartile. |

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