Question 1

A company produces a product which is designed to weigh 10 oz., with a tolerance of  0.5 oz. The process produces products with an average weight of 9.95 oz. and a standard deviation of 0.10 oz. According to the process capability index

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Question 2

Assume that a process is operating on target and 99.8% of the products manufactured just fit within the specification limits. What can you say about the process?

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A process where 99.8% of products fit within specification limits is considered just capable, as it meets the minimum acceptable quality level but does not exceed it significantly.

Question 3

A company produces a product which is designed to weigh 10 oz., with a tolerance of  0.5 oz. The process produces products with an average weight of 9.95 oz. and a standard deviation of 0.10 oz. The process capability ratio for this process is

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The answer of A company produces a product which is...

Question 4

A company manufactures a product that has a design (nominal) target width of 5 inches with tolerances of  .05 inch. The process that produces the product has a mean of 4.995 inches and a standard deviation of 0.01 inch. The process capability ratio for this process is

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Question 5

A company manufactures a product that has a design (nominal) target width of 5 inches with tolerances of  .05 inch. The process that produces the product has a mean of 4.995 inches and a standard deviation of 0.01 inch. The process capability index for this process is

Accepted Answer

The process capability index (Cpk) is calculated as the minimum of two ratios:

Cpk = min[(USL - mean)/3σ, (mean - LSL)/3σ]

where USL and LSL are the upper and lower specification limits, respectively.

In this case, the USL is 5.01 inches (5 + 0.01) and the LSL is 4.99 inches (5 - 0.01).

Substituting these values and the given mean and standard deviation into the formula, we get:

Cpk = min[(5.01 - 4.995)/(3 x 0.01), (4.995 - 4.99)/(3 x 0.01)]
    = min[0.5, 0.1667]
    = 0.1667

Since the minimum of the two ratios is less than 1, the process is not capable of meeting the specifications.

The best choice is therefore B, which is the only option that corresponds to a value less than 1.

Question 6

Using control charts, how do we evaluate whether a process is in control?

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Question 7

A process is generally considered to be in control when

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A process is considered in control when there are no points outside the control limits, most points are near the center line, and points are randomly distributed around the center line.

Question 8

For the process to be capable of meeting design specification, the process capability index must be

Accepted Answer

A process capability index (Cpk) of 1.0 or greater indicates that the process is capable of meeting design specifications. A Cpk of less than 1.0 indicates that the process is not capable of meeting the specifications consistently. Six Sigma is a level of quality that corresponds to a Cpk of 2.0 or greater, but a process does not need to achieve Six Sigma to meet design specifications. Therefore, option B is the correct choice.

Question 9

What is a p-chart and when is it used?

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Question 10

A company produces a product which is designed to weigh 10 oz., with a tolerance of  0.5 oz. The process produces products with an average weight of 9.95 oz. and a standard deviation of 0.10 oz. The process capability index for this process, with z = 3, is

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Question 11

Briefly discuss attribute and qualitative variable quality measures.

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Question 12

Why are  and R-charts used together?

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Question 13

There are several general guidelines associated with the zones for identifying patterns in a control chart, where none of the observations are beyond the control limits. Which of the following is NOT one of those guidelines?

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Question 14

Explain the importance of control chart patterns and give several examples for patterns.

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Question 15

What is a c-chart and when is it used?

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Question 16

A company produces a product which is designed to weigh 10 oz., with a tolerance of  0.5 oz. The process produces products with an average weight of 9.95 oz. and a standard deviation of 0.10 oz. According to the process capability ratio, is the process capable of meeting design specifications?

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Question 17

What is the process capability ratio and how is it calculated?

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Quiz 3: Statistical Process Control

A company produces a product which is designed to weigh 10 oz., with a tolerance of 0.5 oz. The process produces products with an average weight of 9.95 oz. and a standard deviation of 0.10 oz. According to the process capability index

Assume that a process is operating on target and 99.8% of the products manufactured just fit within the specification limits. What can you say about the process?

A company produces a product which is designed to weigh 10 oz., with a tolerance of 0.5 oz. The process produces products with an average weight of 9.95 oz. and a standard deviation of 0.10 oz. The process capability ratio for this process is

A company manufactures a product that has a design (nominal) target width of 5 inches with tolerances of .05 inch. The process that produces the product has a mean of 4.995 inches and a standard deviation of 0.01 inch. The process capability ratio for this process is

A company manufactures a product that has a design (nominal) target width of 5 inches with tolerances of .05 inch. The process that produces the product has a mean of 4.995 inches and a standard deviation of 0.01 inch. The process capability index for this process is

Using control charts, how do we evaluate whether a process is in control?

A process is generally considered to be in control when

For the process to be capable of meeting design specification, the process capability index must be

What is a p-chart and when is it used?

A company produces a product which is designed to weigh 10 oz., with a tolerance of 0.5 oz. The process produces products with an average weight of 9.95 oz. and a standard deviation of 0.10 oz. The process capability index for this process, with z = 3, is

Briefly discuss attribute and qualitative variable quality measures.

Why are and R-charts used together?

There are several general guidelines associated with the zones for identifying patterns in a control chart, where none of the observations are beyond the control limits. Which of the following is NOT one of those guidelines?

Explain the importance of control chart patterns and give several examples for patterns.

What is a c-chart and when is it used?

A company produces a product which is designed to weigh 10 oz., with a tolerance of 0.5 oz. The process produces products with an average weight of 9.95 oz. and a standard deviation of 0.10 oz. According to the process capability ratio, is the process capable of meeting design specifications?

What is the process capability ratio and how is it calculated?