To draw the 3-sigma X-bar chart and R-chart parameters.

A candy bar manufacturer desires to set up a variables control chart for the net weight of its candy bars. It is not exactly clear what charts should be used. A total of 60 candy bar weights (in grams) were obtained and are displayed in the following table.

Sample Number |
Candy Bar 1 |
Candy Bar 2 |
Sample Number |
Candy Bar 1 |
Candy Bar 2 |

1 |
62.671 |
61.740 |
16 |
61.228 |
62.239 |

2 |
62.246 |
62.381 |
17 |
62.305 |
61.37 |

3 |
61.545 |
59.456 |
18 |
61.286 |
61.483 |

4 |
62.233 |
61.409 |
19 |
61.557 |
61.477 |

5 |
59.108 |
61.664 |
20 |
62.147 |
61.476 |

6 |
61.415 |
60.276 |
21 |
62.333 |
61.675 |

7 |
61.872 |
61.979 |
22 |
60.608 |
63.635 |

8 |
62.197 |
61.308 |
23 |
60.907 |
60.126 |

9 |
60.603 |
61.228 |
24 |
60.89 |
60.231 |

10 |
62.007 |
61.305 |
25 |
63.044 |
60.430 |

11 |
61.171 |
59.542 |
26 |
60.677 |
61.664 |

12 |
62.323 |
61.751 |
27 |
61.284 |
62.112 |

13 |
60.707 |
61.921 |
28 |
60.343 |
61.068 |

14 |
62.467 |
60.445 |
29 |
61.42 |
61.122 |

15 |
59.711 |
60.881 |
30 |
62.146 |
60.837 |

a. Set up the 3-sigma X-bar chart and R chart parameters, centerline, and the control limits (n=2).

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