Sample medians and sample ranges (AQA GCSE Statistics): Flashcards
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Practise the cards
10 cards from this deck
What is the target median in a control chart?
What is the target median in a control chart?
The ideal value where production should be centered.
How do you calculate the range of a sample?
How do you calculate the range of a sample?
Subtract the smallest value from the largest value.
What indicates a need for immediate action in charts?
What indicates a need for immediate action in charts?
Sample median falls beyond action limits (±3σ).
What do warning limits indicate in control charts?
What do warning limits indicate in control charts?
They show the range for acceptable process variation.
Why monitor sample ranges in production?
Why monitor sample ranges in production?
To track variability among product measurements.
What should you do if a sample median is within limits?
What should you do if a sample median is within limits?
Continue normal production; everything is fine.
How do you plot a range on a control chart?
How do you plot a range on a control chart?
Mark the calculated range at the corresponding test number.
What happens if all ranges are within warning limits?
What happens if all ranges are within warning limits?
No action is needed; production is acceptable.
What does a missing lower limit on a range chart mean?
What does a missing lower limit on a range chart mean?
It indicates data starts from an unknown lower value.
Why is it important to show calculations in exams?
Why is it important to show calculations in exams?
It demonstrates understanding and secures marks.