For a process having spec limits at ±5ơ, Cp is
OPTIONS 1.66 2 Cannot be determined 1 ANSWER 1.66 EXPLANATION Using standard formula (USL-LSL)/6 * Sigma, the answer is 1.66.
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Category: LSSBB/ Lean Six Sigma Black Belt
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For a process having spec limits at ±4ơ, Cp is
OPTIONS 1.2 1.33 1.6 2 ANSWER 1.33 EXPLANATION Using standard formula (USL-LSL)/6 * Sigma, the answer is 1.33.
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Assuming mean is centered mid-specifications and data being normal, if Cp is 1, what should the value of Cpk be?
OPTIONS Can’t say 1 Slightly less than 1 Slightly more than 1 ANSWER 1 EXPLANATION With the assumptions given, Cpk is equal to Cp thus 1 is correct.
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What should the first question be, before a Black Belt decides to calculate Process capability?
OPTIONS Is the dispersion stableIs the mean shiftingIs the normal distribution shiftingDoes the process exhibit special variability ANSWER Does the process exhibit special variability EXPLANATION A Black Belt cannot calculate capability without knowing if the process is free from special causes or not, so THE...
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What is the most important consideration before calculating Cpk and Ppk for a dataset that is continuous?
OPTIONS Process needs to follow a normal fit for data Process needs to have two specification limits Process needs to have at least one specification limit Process needs to be stable ANSWER Process needs to follow a normal fit for data EXPLANATION While a lot...
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As per Walter Shewhart, which one of the following points is not entirely true?
OPTIONS Most variations in a product resulting in defects are due to Special Causes Variability in a process is due to Common and Special Causes In the short term, one should focus on reducing Common Causes Special Causes result in a process to go unstable...
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Which one of the below points related to Statistical Process Control is not always entirely true?
OPTIONS A stable process is controlled An unstable process is not in control A stable process doesn’t have Special Causes of Variation, mostly A stable process is capable ANSWER A stable process is capable EXPLANATION you cannot definitively say that a stable process is capable...
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Per CLT conditions if the sample size is 33 and the population standard deviation found is 2, what is the sample standard deviation?
OPTIONS 4 2 2/Square root (33) Cannot determine ANSWER 2/Square root (33) EXPLANATION By applying standard CLT Clauses.
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Which one of the below points is true when a process is not stable or not in control?
OPTIONS Special Causes are present There is no variation whatsoever Common causes are present Some times, structural variation are present. ANSWER Special Causes are present EXPLANATION Other options are not serious considerations. When a process is not in control, it is because of special causes...
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Process being stable refers to what of the process?
OPTIONS ReliableDurablePredictable outputRepeatable output ANSWER Predictable output EXPLANATION Stability is often referred to as a state when process produces consistent and predictable output, so Predictable output is the correct answer.
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