Top probability of the top event is represented by which of the following expressions?

Response:

• A.Pr(B1) Pr(B2) - [Pr(B1) + Pr(B2)]
• B.Pr(B1) + Pr(B2)
• C.Pr(B1) + Pr(B2) - Pr(B1) Pr(B2)
• D.Pr(B1) Pr(B2)

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Maintainability can be improved by:
Response:

• A.Increasing the testing rate.
• B.Reducing the hazard rate.
• C.Increasing the repair rate
• D.Reducing the wear-out rate.

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Which of the following is NOT true about the Taguchi DOE approach?
I. It includes the concept of loss function in factorial experiments.
II. It assumes losses occur when a process fails to meet a target value.
III. It assumes losses are due to variability within the process.
IV. It assumes that the loss function is a step function relative to the specification limits.
Response:

• A.I only
• B.IV only
• C.III only
• D.II only

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Ideally for a FRACAS to be effective, how many failures should be allowed to pass before corrective action is to be undertaken?
Response:

• A.Third occurrence of a failure mode.
• B.First occurrence of a failure mode.
• C.Second occurrence of a failure mode.
• D.Fourth occurrence of a failure mode.

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Given the sample data: 5, 15, 10, 7, 20. What is the unbiased estimator of the sample variance?
Response:

• A.27.50
• B.37.30
• C.46.62
• D.29.84

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