Answer:
probably b
Step-by-step explanation:
A crossover design is a reiterated assessments design in which each experimental unit (patient) receives various treatments at different time periods, i.e., the patients switch from one therapy to another during the trial.
<h3>What is the advantage of a crossover design?</h3>
The crossover design has the benefit of each subject acting as his or her own control, and it requires a lesser number of patients than parallel-group trials.
There are various drawbacks. For example, crossover designs often last longer than parallel-group research.
Learn more about experiments at;
brainly.com/question/16286146
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45 / 2 is equal to: 22 1/2. brainliest?