### Chapter 6 Problem A metal fabricator produces connecting rods

**Chapter 6 Problem A metal fabricator produces connecting rods**

1.A metal fabricator produces connecting rods with an outer diameter that has a 1.028±0.04 inch specification. A machine operator takes several sample measurements over time and determines the sample mean outer diameter to be 1.012 inches with a standard deviation of 0.007 inch.

2. Ten samples of 15 parts each were taken from an ongoing process to establish a p chart for control. The samples and the number of defectives in each are shown in the following table:

SAMPLE n NUMBER OF

DEFECTS IN

SAMPLE SAMPLE n NUMBER OF

DEFECTS IN

SAMPLE

1 15 3 6 15 0

2 15 0 7 15 2

3 15 1 8 15 3

4 15 3 9 15 2

5 15 2 10 15 2

3.

A shirt manufacturer buys cloth by the 100 yard roll from a supplier. For setting up a control chart to manage the irregularities (e.g., loose threads and tears) the following data was collected from a sample provided by the supplier.

SAMPLE 1 2 3 4 5 6 7 8 9 10

IRREGULARITIES 6 5 6 8 6 4 7 7 7 5

(b) Suppose the next five rolls from the supplier had nine, two, five, seven and six irregularities. What is the UCL?

(c) Is the supplier process under control?

- Budget: $8 Ready
- Posted by: JamesJr
- Subjects: General Questions Fluid Dynamics

**Chapter 6 Problem A metal fabricator produces connecting rods Solution**

Calculate the process capability index for this example. 1.143

Explanation:

=1.143

2.

Ten samples of 15 parts each were taken from an ongoing process to establish a p chart for control. The samples and the number of defectives in each are shown in the following table:

SAMPLE n NUMBER OF

DEFECT...

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