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GMS401

Chapter 7: Statistical Quality Control

TermDefinition
Statistical Quality Control Uses statistical techniques & sampling to monitor & test the quality of goods & services
Acceptance sampling Determines to accept or reject a product
Statistical process control Determines if process is operating within acceptable limits
Inspection The appraisal of goods/services against standards
Statistical Process Control (SPC) Steps 1. Take periodic samples from process 2. Compare to predetermined limits (if outside limits, stop process and take corrective action. If inside limits, continue process)
Random variation Natural variations in the output of process, created by countless minor factors
Assignable variation A variation whose source can be identified
Control Chart Monitors process output to distinguish between random and assignable variation. A time ordered plot of sample statistics obtained from an ongoing process. Upper and lower control limits define the range of acceptable variation.
Control Limits The diving lines between random and nonrandom deviations from the process mean
Type I error Concluding that a process has changed when it has not
Type II error Concluding a process is in control when it is actually not
p-Chart Control chart used to monitor the proportion of defectives in a process
c-Chart Control chart used to monitor the number of defects per unit
Design Specifications Ranges of acceptable values established by engineering design or customer requirements
Process variability Natural variability in a process
Process capability Process variability relative to specification
Improving Process Capability Simplify, standardize, mistakeproof, upgrade equipment, automate
Capability Analysis A methodology that is used to show how well parts being produced fit into a range specified by design limits.
Created by: 13rallie
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