# Evaluate 5.2 Problem 17

Management at Webster, in Problem 16, is now concerned as to whether caulking tubes are being properly capped. If a significant proportion of the tubes are not being sealed, Webster is placing its customers in a messy situation. Tubes are packaged in large boxes of 144. Several boxes are inspected, and the following numbers of leaking tubes are found (see attached table).

Calculate p-chart three sigma control limits to assess whether the capping process is in statistical control.

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# Sheet1

xxxxxxxxxxxxxxxxxxxxxxxxxx | xxxxx | ||

x | 3 | ||

x | x | ||

x | 3 | ||

4 | x | xx xxxxxxx 0.5 | |

x | 2 | ||

x | 4 | ||

x | x | ||

8 | x | ||

9 | 4 | ||

xx | 9 | ||

11 | x | ||

xx | x | ||

13 | 5 | ||

xx | 1 | UCL= xxx x x xxxx xxxx x 0.5)/144= | xxx +0.042= xxxxx |

15 | 5 | ||

xx | x | LCL= 0.5-0.042 x xxxxx | |

17 | 2 | ||

xx | 6 | ||

19 | 2 | ||

20 | x | ||

xxxxx | xx |

# xxxxxx

# xxxxxx

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