Two clinical trials were designed to test the effectiveness of laser treatment f

Question

Two clinical trials were designed to test the effectiveness of laser treatment for acne. Seaton et al. (2003) randomly divided participants into two groups. One group received the laser treatment, whereas the other group received a sham treatment. Orringer et al. (2004) used an alternative design in which laser treatment was applied to one side of the face, randomly chosen, and the sham treatment was applied to the other side. The number of facial lesions was the response variable.

Orringer et al. used _____ in a _____ design.

Seaton et al. used a completely ______ design.

Explanation / Answer

Orringer et. al. used blocks in a randomised block design.

Seaton et al. used a completely randomised design

EXPLANATIION:

In the randomised block design, the experimenter divides the participants into subgroups called blocks such that the variability within blocks is less than the variability between blocks.

In the completely randomised design, participants are randomly assigned to treatments.

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