ASQ - Statistics Division

Two-Stage Nested Designs – Mini Paper Appearing in Fall 1984 Newsletter

Abstract: The example involves comparing part means in two lots where each lot has five parts. In a two-stage nested design, the particular lots are to be compared by examining five randomly chosen parts from each lot. Since the parts are chosen randomly from two particular lots, the model is “mixed”, with lots being a fixed factor and parts a random factor. An analysis of variance yields the right statistic to test the equality of means of these lots.

Keywords: Nested Design - Analysis of Variance (ANOVA) - Equality of Means

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