Planning and Prediction Flashcards
what strategies can be used to detect non conformance
- pinpoint
- follow a trend
what does AQL stand for and what does it mean
acceptance quality level- arbitrary value selected by producer
- usually relates to non conforming units in population associated with alpha
what does UQL stand for
unacceptable quality level
What does AOQL stand for
average outgoing quality level
what does LTPD stand for and what does it mean
Lot tolerance percent defective
- arbitrary worst quality level selected by the consumer
- usually relates to non conforming units in population associated with Beta
what does H0 mean
proportion of defectives is as stated (<AQL)
- process is stable when H0 is not rejected
- process is not stable when H0 is rejected
what does H1 mean
proportion of defectives has changed from those stated (>AQL)
how can error at sampling point be reduced
a plan and strategy for effective, reproducible and representative sampling
what is AQL associated with
defining quality we would accept
- associated with probability
what is LTPD associated with
quality we do not want
- associated with probability
what do sampling plans provide
provide an effective check on quality
what is an operating characteristic curve
a graphical representation of sampling plan
- plot of the probability of accepting a batch of product against quality, usually defined by the proportion of defectives in a given sample
what does a larger sample size on a operating characteristic curve mean
larger sample size means larger acceptance probability
give an equation for calculating probability
probability= number of times an event occurred/total number of possible events
give an equation for calculating quality (as %defectives)
quality= average number of defective samples/total number of samples x100
