A Medical Journal Published the Results of an Experiment on Insomnia

Multiple Choice

A medical journal published the results of an experiment on insomnia. The experiment investigated the effectsof a controversial new therapy for insomnia. Researchers measured the insomnia levels of 40 adult women whosuffer moderate conditions of the disorder. After the therapy, the researchers again measured the womenʹsinsomnia levels. The differences between the the pre- and post-therapy insomnia levels were reported. Whattype of experimental design is this?

A) matched-pairs design
B) completely randomized design
C) randomized block design
D) single-blind design