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Quality Planning & Control Charts Flashcards

7 cards from real PMI practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 Quality Planning & Control Charts flashcards as text

  1. A process capability index (Cp) of 1.33 indicates that:

    Answer: The process spread fits within the specification limits with a safety margin

    A Cp of 1.33 means the process spread (6σ) occupies only 75% of the specification width, providing a reasonable safety margin — it is considered a minimum acceptable capability level.

  2. What distinguishes Cpk from Cp in process capability analysis?

    Answer: Cpk accounts for process mean centering; Cp assumes the mean is perfectly centered

    Cpk measures how close the process mean is to the nearest specification limit, penalizing off-center processes that Cp would rate as capable.

  3. In a fishbone (Ishikawa) diagram used for quality planning, the 'bones' branching off the spine typically represent:

    Answer: Major categories of potential causes of a quality problem

    The branches of a fishbone diagram represent major cause categories (e.g., Man, Machine, Method, Material, Measurement, Environment) from which specific causes are brainstormed.

  4. Which type of control chart would be MOST appropriate for monitoring the number of blemishes found per car in an automotive paint inspection where every car is inspected?

    Answer: c-chart

    A c-chart is used when counting defects per unit with a constant inspection unit (each car), following the Poisson distribution.

  5. A project quality plan states the process must operate within ±2σ of the mean. What percentage of output would theoretically fall within these limits for a normal distribution?

    Answer: 95.45%

    For a normal distribution, ±2 standard deviations from the mean encompasses approximately 95.45% of all values.

  6. What is 'acceptance sampling' in quality control?

    Answer: Inspecting a random sample from a lot to decide whether to accept or reject the entire lot

    Acceptance sampling uses statistical sampling of a batch to decide whether to accept or reject the entire lot, balancing inspection cost against risk of accepting defective products.

  7. In quality management, 'sigma level' (e.g., Six Sigma) refers to:

    Answer: How many standard deviations fit between the process mean and the nearest specification limit

    Sigma level measures how many standard deviations of the process distribution fit between the mean and the nearest spec limit, with higher sigma levels producing fewer defects.