Term
| What is statistical control quality concerned with |
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Definition
Answers if process is capable
Lets you know the need to do corrective action
control charts generated to help make choices |
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Term
| Main function of quality control |
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Definition
Determine which type of variation is present
Estimate certain parameters
provide info that is useful in improving the process |
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Term
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Definition
Middle line for mean of the observed characterisitcs
UCL AND LCL to show lowest and highest level of quality acceptance in a process.
3 STD DEV for the UCL AND LCL |
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Term
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Definition
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Term
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Definition
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Term
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Definition
| Zone rules, Shewhart Rules |
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Term
| Process Capability Assumptions |
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Definition
1. Normal distro
2. in control
3. centered between UCL and LCL
4. Cp measure process capability
5. Cpk measures actual capability
6. if mean is no centered, Cp is misleading |
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Term
| What is acceptance sampling |
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Definition
1. Concerned with inspections and decision making
2. used for incoming and receiving inspections
3.Sentence lots, not get overall quality
4. Not a direct form of quality control |
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Term
| When to use acceptance sampling |
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Definition
1. When 100% inspection is not feasible
2. Inspection requires destruction
3. When 100% testing is time consuming |
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Term
| Pro of acceptance sampling |
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Definition
Less expensive
Less product handling
fewer personnel involved
reduces error
rejects lot instead of defective found |
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Term
| Con of acceptance sampling |
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Definition
Risk of acepting bad lot, rejected good lot
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Term
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Definition
| Acceptance sample plan where picking one item does not effect the chances of picking another |
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Term
| Operating Characteristic Curve (OC) |
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Definition
| Probability of the lot vs. the fraction defective |
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Term
| Acceptable Quality Level (AQL) |
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Definition
| The lowest level of quality accepted by consumers while still accepting the lot |
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Term
| Limited Quality Level (LQL) |
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Definition
| Poorest level of qulaity the consumer is willing to accept in an individual lot |
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Term
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Definition
| Corrective action program to correct the lot quality |
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Term
| Avergae Outgoing Quality (AOQ) |
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Definition
| Expected quality level of outgoing product for value on incoming product quality |
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Term
| Sampling Inspection by Attribute, USE |
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Definition
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Term
| Sampling Inspection by Variable |
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Definition
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Term
| What is Experimental Design |
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Definition
| Test or series of test to purposefully make changes to input variables to see the significant changes to the output variable, to correct or change a process |
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Term
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Definition
1. Determine what input variables are influential on Y
2. Determing the level of the input variable to get it to the requirement
3. Determine setting of X to get variability small of Y
4. Determine settings of X to minimize Z (environmental Variable) |
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Term
| Difference between SPC and Experimental Design |
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Definition
| SPC is passive method while you wait for data to come up with a change, while experimental design deals with active attempts to change variables to find the best changes |
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Term
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Definition
| Variable that is assumed to affect the dependent variable |
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Term
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Definition
| Output variable of interest |
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Term
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Definition
| Input variable that may or may not affect the experimental results but which are not easily controlled by experiments |
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Term
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Definition
| Each independent variable that could affect the dependent (rubber band and ball=2) |
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Term
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Definition
| "High and Low" values for the factors |
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Term
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Definition
| Specific combination of the levels imposed on a single unit of material |
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Term
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Definition
| Running 2 or more identical runs of the experiment units are subjected to the same treatment |
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Term
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Definition
| Random order or experimental trials and for specific inputs |
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Term
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Definition
| Use of Blocks and subdivision of the experimental space into homogenous experimental units |
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Term
| Reliability of Probability |
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Definition
| Probability that the product or system will function when activated |
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Term
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Definition
| Situation which an iteam does not perform as intended |
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Term
| Reliabbility of Operating Conditions |
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Definition
| How the product SHOULD be used |
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Term
| Combine probability, failure, and operating conditions for reliability |
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Definition
| Probability ( Probability is .05 that this light bulb) failure (will NOT provide light for at least 1000 hours) operating conditions (when operted in normal household environment) |
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Term
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Definition
| Do nothing until failure happens |
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Term
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Definition
| Predetermined maintence scheduled, even when nothings wrong |
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Term
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Definition
| attempts to predict time to failure |
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Term
| Availability of Maintenance |
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Definition
| MTBF (mean time between failures)/ MTBF + MTTR (mean time to repair, including wait time) |
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Term
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Definition
| Factors varied together for an experiment |
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Term
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Definition
| All possible combinations of factors in an experiment |
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Term
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Definition
| Equal number of observations |
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Term
| One factor at a time design |
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Definition
| Not concerned with interactions of factors |
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Term
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Definition
| Decomposses total varaibility in the sample data into four component parts |
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