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CPC Quality Assurance & Standards Flashcards

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

Read the first 6 CPC Quality Assurance & Standards flashcards as text

  1. In analytical chemistry, precision refers to:

    Answer: The reproducibility of repeated measurements under the same conditions

    Precision describes the reproducibility or repeatability of measurements, quantified by standard deviation or %RSD, independent of whether results are close to the true value.

  2. A standard reference material (SRM) issued by NIST is used in analytical chemistry to:

    Answer: Validate measurement accuracy and ensure traceability to national standards

    NIST SRMs have certified property values with stated uncertainties, enabling analysts to validate method accuracy and establish metrological traceability to national/international standards.

  3. The method detection limit (MDL) in EPA methodology is defined as the minimum concentration that can be:

    Answer: Distinguished from zero with 99% confidence (based on 7-replicate study)

    EPA's MDL is defined as the minimum concentration distinguishable from zero with 99% confidence, calculated as t(n-1, 0.99) × s from at least 7 replicate measurements at low concentration.

  4. ISO/IEC 17025 accreditation for testing laboratories requires which key element?

    Answer: A documented quality management system with defined competence, impartiality, and consistent operation

    ISO/IEC 17025 requires laboratories to implement a quality management system demonstrating technical competence, impartiality, and consistent reliable results through documented policies and procedures.

  5. A control chart in a laboratory quality system shows a sample mean outside the ±3σ control limits. This indicates:

    Answer: A likely out-of-control condition requiring investigation

    Points outside ±3σ limits occur by chance less than 0.3% of the time in a stable process, so their occurrence signals a likely assignable cause requiring investigation and corrective action.

  6. Which of the following is an example of a Type B uncertainty evaluation in measurement uncertainty estimation?

    Answer: Using calibration certificate uncertainty values and equipment specifications

    Type B uncertainty is evaluated by means other than statistical analysis of repeated measurements, such as using calibration certificates, manufacturer specifications, or reference data.