lab 8 - EXST 7005 Fall 2010 Lab #8: Single Factor CRD &...

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1 EXST 7005 Fall 2010 Lab #8: Single Factor CRD & One-way ANOVA Single Factor CRD In a single factor Completely Randomized Design (CRD), there is only one treatment factor and the levels of the factor are randomly assigned to the experimental units. Each experimental unit receives one and only one experimental treatment. For example, an experiment could be conducted to compare the mean yields of several varieties of wheat. The field plots (experimental units) are randomly assigned one of the varieties of wheat. One-way ANOVA The ANOVA (short for “the analysis of variance”) is one of the most powerful and general techniques for data analysis. It is applicable to a variety of experimental situations. However, before applying the appropriate ANOVA technique, it is extremely important that you understand the experimental design. The ANOVA applied to a single factor Completely Randomized Design is often called the “one-way ANOVA.” The ANOVA could be viewed as an extension and generalization of the two-sample t-test to the case of two or more groups. When you are comparing three or more means, doing multiple two- sample t-tests would result in a largely increased chance of committing a type I error. The
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lab 8 - EXST 7005 Fall 2010 Lab #8: Single Factor CRD &...

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