CTD 461 Lecture Notes - Lecture 13: Type I And Type Ii Errors, Acceptance Sampling, Observational Error
9 May 2017
School
Department
Course
Professor
Document Summary
If sample drawn from lot so that each item has an equal chance of being selected then any problems should be present in the sample. Sampling and statistics: universe: entire population being tested- the entire group about which you wish to obtain information (lot) In fabric production, this might refer to a 250,000-yard production run to fill an order for a fabric for a particular end use. If the fabric is woven, perhaps 50 looms, each weaving 5,000 yards, are involved: sample: that portion of the universe which is selected for testing. For the case above, if each loom produces five 1,000-yard rolls, and each roll is sampled once, then there will be 5x50 = 250 samples taken to characterize the production. Each samples consist of a 3-5 yard length taken from each roll: specimen: a specific portion of a sample upon which a particular test is performed. Randomly select a set of number and pull the product.
