Mean Absolute Deviation

My Definition

Key Characteristics

The following are true of mean absolute deviation:

- It is calculated by averaging the absolute value of the differences between each data point and the mean value of the data set.
- It is a measure describing the variability of a data set.
- A data set has less variability when the mean absolute deviation is closer to zero.

Example

Non-example

The amounts of money raised by each homeroom selling tickets to the eighth-grade dance are shown below.

HR | Amount Raised |

801 | $88 |

802 | $116 |

803 | $94 |

804 | $108 |

805 | $112 |

806 | $124 |

Each homeroom raised an average of $107 selling tickets to the dance.

TEKS: 8(11)(B)