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Value of the mean absolute deviation

The table below provides a firm's sales. Given: ? = 0.2, ? = 0.15, and ? = 0.05 and placing the data into quarters.

a) Calculate the value of the mean absolute percentage error for the given data.

b) What is the value of the mean absolute deviation for the given data?

c) What will be the predicted sales for February of the next quarter?

Year |
Month |
Units |

01 | Jan | 3980 |

01 | Feb | 4000 |

01 | Mar | 4740 |

01 | April | 4720 |

01 | May | 4920 |

01 | Jun | 5140 |

01 | July | 4640 |

01 | Aug | 4520 |

01 | Sep | 4480 |

01 | Oct | 4690 |

01 | Nov | 4210 |

01 | Dec | 4418 |

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