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 participants to test the effectiveness of laser treatment for ance in a controlled randomized design.

Because he using alternative design to compare two groups.

Seaton et al. used a completely randomized design.

Because he want to divide patients in to two groups, means it parallel design and randomized.

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