Completely Randomized Designs

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Overview

Questions

• What is a completely randomized design (CRD)?

Objectives

• CRD is the simplest experimental design.
• In CRD, treatments are assigned randomly to experimental units.
• CRD assumes that the experimental units are relatively homogeneous or similar.
• CRD doesn’t remove or account for systematic differences among experimental units.

A single qualitative factor

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Analysis of variance (ANOVA)

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Equal variances and normality

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Inference

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A single quantitative factor

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Design issues

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Key Points

• CRD is a simple design that can be used when experimental are homogeneous.