Lesson 2g.02

2g.02 Use action and warning lines in quality assurance sampling applications Quiz: Pearson Edexcel Statistics, Unit 2

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson 2g.02, Use action and warning lines in quality assurance sampling applications: 20 multiple choice questions for the Pearson Edexcel GCSE Statistics (1ST0), Unit 2: Processing, representing and analysing data, written with Revision Ninja.

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The 20 questions

  1. What is the usual position of warning lines on a quality control chart?

    • 2 standard deviations
    • 3 standard deviations
    • 1 standard deviation
    • 4 standard deviations

  2. Where are action lines set on a quality control chart?

    • 2 standard deviations
    • 5 standard deviations
    • 3 standard deviations
    • 1 standard deviation

  3. In a stable process, about what proportion of sample means fall outside the warning lines?

    • 1 in 100
    • 1 in 1000
    • 1 in 20
    • 1 in 2

  4. Where should almost all sample means lie in a stable manufacturing process?

    • Beyond action limits
    • Below zero level
    • Outside warning lines
    • Inside action lines

  5. What is the standard response when a sample value falls beyond the action lines?

    • Monitor closer
    • Ignore value
    • Take average
    • Stop process

  6. What does a sample point between the warning and action lines typically prompt?

    • Closer monitoring
    • Stop process
    • Ignore value
    • Re-calibrate scale

  7. Which type of chart is commonly used in quality assurance control applications?

    • Scatter diagram
    • Pie chart
    • Sample ranges chart
    • Bar graph

  8. What is the primary purpose of a control chart in manufacturing?

    • Calculate averages
    • Design products
    • Detect limit breaches
    • Measure total output

  9. A process has an expected mean of 50 g and the sample means have an SD of 2 g. What are the warning lines?

    • 46 g and 54 g
    • 40 g and 60 g
    • 44 g and 56 g
    • 48 g and 52 g

  10. A sample mean of 57 g exceeds the 56 g action limit. What is the required action?

    • Increase sample size
    • Continue monitoring
    • Record as normal
    • Stop process

  11. A bag-filling process has expected mean 15.0 kg and SD 0.1 kg for sample means. Which sample mean would be outside an action line?

    • 15.15 kg
    • 15.35 kg
    • 14.85 kg
    • 15.25 kg

  12. A warning line is at 22 g and the expected mean is 20 g. What is the SD of the sample means?

    • 1 g
    • 3 g
    • 0.67 g
    • 2 g

  13. In a stable process, about how many of 200 sample means would be expected outside the warning lines?

    • 10
    • 2
    • 20
    • 100

  14. In quality assurance charts, how do warning lines compare in position to action lines?

    • Both lines identical
    • Action lines closer
    • Warning lines closer
    • Warning lines outside

  15. A chart's centre line is at 80 units, with action lines at 74 and 86. What is the SD of the sample means?

    • 4 units
    • 6 units
    • 2 units
    • 3 units

  16. A process mean is 100 ml, with warning lines at 96 ml and 104 ml. What are the action lines?

    • 90 ml and 110 ml
    • 92 ml and 108 ml
    • 94 ml and 106 ml
    • 96 ml and 104 ml

  17. A population has mean 50 and SD 6. Samples of size 9 are used. What are the action lines for the sample means?

    • 47 and 53
    • 46 and 54
    • 44 and 56
    • 41 and 59

  18. Out of 60 stable process sample means, 9 fall outside the warning lines. What is this?

    • Lower than expected
    • Higher than expected
    • Exactly as expected
    • Impossible result

  19. Why is a point just outside an action line treated more seriously than a warning line breach?

    • Easier to calculate
    • Occurs more often
    • Much lower probability
    • Cheaper to fix

  20. A chart shows 19 points inside warning lines and 1 outside the action line. What should be done?

    • Ignore outlier
    • Reset all lines
    • Double sample rate
    • Investigate point

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