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QBA QC

statistical quality control
emphasizes in-process control with the objective of controlling the quality of a manufacturing process or service operation using sampling techniques
statistical sampling techniques
used to aid in the manufacturing of a product to specifications rather than attempt to inspect quality into the product after its manufactured
control charts
useful for monitoring a process
six sigma
program designed to improve quality and performance throughout the company
Lean Six Sigma
a business improvement methodology that maximizes shareholder value by achieving the fastest rate of improvement in customer satisfaction, cost, quality, process speed, and invested capital
why is the fusion of lean and six sigma improvement methods required
lean cannot bring a process under statistical control, six sigma alone cannot dramatically improve process speed or reduce invested capital, both enable the reduction of the cost complexity
chance variation
random in nature and cannot be entirely eliminated
assignable variation
nonrandom in nature and can be reduced or eliminated by investigating the problem
two most prominent technique charts
pareto charts and fishbone diagrams
components of fishbone diagram
methods, materials, equipment, and personnel
purpose of quality control charts
to portray graphically when an assignable cause enters the production system so that it can be identified and corrected
percent defective chart (p-chart)
graphically shows the proportion of the production that is not acceptable
proportion of defectives formula
total defective/number of samples
c-chart
designed to control the number of defects per unit
acceptance sampling
a method of determining whether an incoming lot of a product meets specified standards
what is acceptance sampling based on
random sampling techniques
c in acceptance sampling
the max number of defective units that may be found in the sample
type 1 error
producer’s risk
operating characteristic curve
developed using the binomial probability distribution in order to determine the probabilities of accepting lots of various quality level
attribute sampling
OC sampling

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