Design of Experiments Jim Bohan Manheim Township School District

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Design of Experiments Jim Bohan Manheim Township School District jim_bohan@mail.mtwp.k12.pa.us

Three Requirements Comparison Randomization Replication Groups that are a similar as possible. How do we make groups as similar as possible? Randomization Minimize the effect of confounding influences and lurking variables by spreading these effects equally throughout the groups. Replication Is the sample size sufficient so that the differences in responses is due to treatments and not chance?

Two Major Designs Completely Randomized Design Randomized Block Design

Completely Randomized Design Example: Random Assignment Treatment 1 Results Treatment 2 Results Compare Control Results

Randomized Block Design Example: Random Assignment Treatment 1 Results Block 1 Compare Treatment 2 Results Compare Block 2 Compare

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