Quality assurance and control charts (Edexcel GCSE Statistics): Flashcards
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Warning limits for μ=330, σ=2.4?
Warning limits for μ=330, σ=2.4?
325.2 ml and 334.8 ml
Action limits for μ=330, σ=2.4?
Action limits for μ=330, σ=2.4?
322.8 ml and 337.2 ml
Action for mean=333.17 with w.limits 325.2–334.8?
Action for mean=333.17 with w.limits 325.2–334.8?
No action; within warning limits
Chance a working process is outside ±3σ?
Chance a working process is outside ±3σ?
0.3% probability
Summarise the three-step control action
Summarise the three-step control action
Within ±2σ: do nothing; between: retest; outside ±3σ: stop
μ=330 σ=2.4. Find warning & action limits.
μ=330 σ=2.4. Find warning & action limits.
Warn 325.2–334.8; Action 322.8–337.2
Mean outside ±3σ. What action?
Mean outside ±3σ. What action?
Stop machine, check it and reset
Find warning & action limits: μ=330, σ=2.4
Find warning & action limits: μ=330, σ=2.4
Warning 325.2 to 334.8; Action 322.8 to 337.2
Total 3998 for 12 bottles; what action?
Total 3998 for 12 bottles; what action?
Mean = 333.17 ml; between warning and action: retest
Find warning and action limits for mu=330 sigma=2.4
Find warning and action limits for mu=330 sigma=2.4
Warning: 325.2 to 334.8 ml; Action: 322.8 to 337.2 ml