Key Terms
statistical quality control (SQC) 198
descriptive statistics 198
statistical process control (SPC) 199
acceptance sampling 199
common causes of variation 200
assignable causes of variation 200
mean (average) 200
range 201
standard deviation 201
control chart 202
out of control 202
variable 203
attribute 203
x-bar chart 204
range (R) chart 208
p-chart 211
c-chart 214
process capability 216
product specifications 216
process capability index 217
Six Sigma quality 221
sampling plan 223
operating characteristic (OC) curve 224
acceptable quality level (AQL) 224
lot tolerance percent defective (LTPD) 225
consumer's risk 225
producer's risk 225
average outgoing quality (AOQ) 227
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