Lecture M: Randomized Complete Block Designs Text Section 9.4 Completely Randomized Design (CRD)Ex. Want to study effect of 4 formulations of fertilizer (call them A, B, C, and D) on yield in corn. Potential experimental designs: 1. Put seeds in individual pots. Apply the fertilizer to the pots (the experimental unit). 2. Plant corn in farm plots. Fertilizer applied with sprayers to 1 acre-plots (the experimental units). Will measure "yield" as a single value per 1-acre plot. Therefore will need multiple 1-acre plots for each fertilizer for replicates. 2a. Randomly select 20 farms, each farm will get one fertilizer 2b. Randomly select 5 farms, each farm will have 4 1-acre plots, one for each fertilizer. Knapp Stat 350 Lecture M: RCBD Spring 2009 Page 1 of 1
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