Experimental Design
Common Core: S.IC.3

Experimental Design


This lesson will explain the three principles of experimental design

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  • Experimental Design

    The way in which an experiment is carried out. A good design has key elements of randomization, replication, and control.

  • Treatment

    Something the researchers administer to the subjects or experimental units.

  • Control

    The principle of experimental design that requires that other variables which may confound the experiment be held constant between the treatment groups, so that any differences in the groups can be attributed to the different treatments.

  • Randomization

    The principle of experimental design that requires that the subjects/experimental units be assigned to groups using some random process. This ensures that the two groups are roughly equal prior to assigning treatments.

  • Replication

    Repeating the experiment on multiple subjects/experimental units. This principle of experimental design that states that a larger experiment with more subjects/experimental units will allow us to more clearly see differences between the treatments.