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Q 268. 'The results are only as good as the sample' and hence it is imperative to select a good sample. What are the key considerations while sampling in order to get a good sample? Note for website visitors - Two questions are asked every week on this platform. One on Tuesday and the other on Friday. All questions so far can be seen here - https://www.benchmarksixsigma.com/forum/lean-six-sigma-business-excellence-questions/ Please visit the forum home page at https://www.benchmarksixsigma.com/forum/ to respond to the latest question open till the next Tuesday/ Friday evening 5 PM as per Indian Standard Time. Questions launched on Tuesdays are open till Friday and questions launched on Friday are open till Tuesday. The best answer is always shown at the top among responses and the author finds honorable mention in our Business Excellence dictionary at https://www.benchmarksixsigma.com/forum/business-excellence-dictionary-glossary/ along with the related term
In a cold rolling mill, a sample is taken for inspection at a frequency of one in 10 coils. This frequency was not arrived at scientifically (i.e without any logic). On an average 152 coils are rolled in a 24 hours shift. This sampling frequency eats up on the production capacity. On a typical day the rolling schedule contains a wide variety of SKU's (alloy, width, gauge, temper etc) depending on the delivery priorities. Historical data pertaining to the defects identified on the samples are available. How do we arrive at an optimum sampling frequency based on historical data?