**Question: ** 18. The following shows the monthly sales in units of six salespersons before and after a bonus plan was introduced. At 95% confidence, construct the interval for the difference in the Matched Pairs.

Monthly Sales | ||

Salesperson | After | Before |

1 | 94 | 90 |

2 | 82 | 84 |

3 | 90 | 84 |

4 | 76 | 70 |

5 | 79 | 80 |

6 | 85 | 80 |

Subtract the two columns to get the differences. Then just plug those into List 1 in your calculator to find the average of the differences (d-bar) and the standard deviation would be S_{d}. Then just build the interval.

**Solution:**The solution consists of 212 words (2 pages)

**Deliverables:**Word Document