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Design and Analysis of Experiments by Douglas Montgomery: A Supplement for Using JMP by James Wisnowski, Andrew Karl, Heath Rushing

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13Experiments with Random Factors

Example 13.1 A Measurement Systems Capability Study

Example 13.3 The Unrestricted Model

Example 13.5 A Three-Factor Factorial Experiment with Random Factors

Example 13.6 Approximate F Tests

For some experiments, the factor levels included in the design are the only ones of interest. For example, a grocery store may be considering one of four possible layouts for a soft-drink display. A randomized experiment will allow the store to determine if there is a difference in sales across the four layouts, and the layout with the best sales may be chosen. By contrast, some factor levels are only samples of a large population of possibilities. A manufacturer may want to test for operator-to-operator variability in a process. ...

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