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Statements

Subject Item
dbr:Spatial_distribution
dbo:wikiPageWikiLink
dbr:Variables_sampling_plan
Subject Item
dbr:Acceptance_sampling
dbo:wikiPageWikiLink
dbr:Variables_sampling_plan
Subject Item
dbr:Variables_sampling_plan
rdfs:label
Variables sampling plan
rdfs:comment
In statistics, a variables sampling plan is an acceptance sampling technique. Plans for variables are intended for quality characteristics that are measured on a continuous scale. This plan requires the knowledge of the statistical model (e.g. normal distribution). The historical evolution of this technique dates back to the seminal work of W. Allen Wallis (1943). The purpose of a plan for variables is to assess whether the process is operating far enough from the specification limit. Plans for variables may produce a similar OC curve to attribute plans with significantly less sample size. or
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dbc:Sampling_(statistics)
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1052349060
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dbr:Statistical_model dbr:Standard_deviation dbr:Acceptable_quality_limit dbr:Acceptance_sampling dbr:Normal_distribution dbr:Critical_distance n16:MIL-STD-414 dbr:Industrial_Research dbr:Statistics dbr:Evolution_of_mathematics dbr:W._Allen_Wallis dbc:Sampling_(statistics) dbr:Dispersion_(statistics) dbr:Sample_size_determination dbr:Sample_mean dbr:Variable_(mathematics)
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n4:pmc232.htm n7:MIL-STD-414%7C n10:sampling-variables-military-standard-414-tables
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dbo:abstract
In statistics, a variables sampling plan is an acceptance sampling technique. Plans for variables are intended for quality characteristics that are measured on a continuous scale. This plan requires the knowledge of the statistical model (e.g. normal distribution). The historical evolution of this technique dates back to the seminal work of W. Allen Wallis (1943). The purpose of a plan for variables is to assess whether the process is operating far enough from the specification limit. Plans for variables may produce a similar OC curve to attribute plans with significantly less sample size. The decision criterion of these plans are or where and are the sample mean and the standard deviation respectively, is the critical distance, and are the upper and lower regulatory limits. When the above expression is satisfied the proportion nonconforming is lower than expected and therefore the lot is accepted. A variables sampling plan can be designed so that the OC curve passes through two points (AQL,) and (LQL,). AQL and LQL are the Acceptable quality limit and the limiting quality level respectively. and are the producer and consumer's risks. The required sample size and the critical distance can be obtained as where is the normal distribution function. When the dispersion is known the required sample size is obtained from while for unknown the sample size is approximately The provides tables to obtain the required sample size and the critical distance according to the type of inspection.
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wikipedia-en:Variables_sampling_plan?oldid=1052349060&ns=0
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wikipedia-en:Variables_sampling_plan
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