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DerKrebs [107]
3 years ago
8

A process that produces computer chips has a mean of .04 defective chip and a standard deviation of .003 chip. The allowable var

iation is from .034 to .046 defective. a.Compute the capability index (Cp) for the process. (Round your intermediate calculations to 3 decimal places and final answer to 2 decimal places.) Capability index b. Is the process capable? Yes or No
Business
1 answer:
Anarel [89]3 years ago
6 0

Answer:

a) 0.667

b) Yes

Explanation:

Data provided in the question:

Mean = 0.04

Standard Deviation = 0.003

Upper Specification Limit, USL = 0.046

Lower Specification Limit, LSL = 0.034

Now,

a) Capability Index is given as:

Cp = \frac{(USL-LSL)}{(6\sigma)}

or

Cp = \frac{(0.046-0.034)}{(6\times0.003)}

or

Cp = 0.667

Also,

Cpk = min(\frac{(USL-Mean)}{(3\sigma)},\frac{(Mean-LSL)}{(3\sigma)}

or

Cpk = min(\frac{(0.046-0.04)}{(3\times0.003)},\frac{(0.04-0.034)}{(3\times0.003)}

or

Cpk = min( 0.667 , 0.667 )= 0.667

Since,

Cp and Cpk are same in this case

therefore, it is ideal condition and process is capable

b) yes

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