Murielle has been feeling a lot better these past few weeks after she started avoiding caffeine. The procedure that Murielle has used to test the effects of caffeine is most similar to the _____ design, which is _____ for drawing firm conclusions about the effects of caffeine.

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Murielle's approach is similar to a simple-comparison design, where she compares her condition before and after eliminating caffeine. However, this design is inadequate for drawing firm conclusions about the effects of caffeine because it lacks a control group and does not account for other variables that could influence the outcome.

Murielle Has Been Feeling a Lot Better These Past Few