Final answer:
Rachel's study of how sleep deprivation affects driving patience exemplifies the use of the scientific method in psychology, as it utilizes a controlled, systematic, and empirical approach to testing a clear hypothesis.
Step-by-step explanation:
Rachel's work, where she studies how sleep deprivation affects patience while driving, particularly looking at honking behaviors in relation to hours of sleep, is an example of the scientific method. By using driving simulators to maintain consistency across testing conditions and by examining behaviors of two distinct groups differentiated by hours of sleep, Rachel is engaging in a systematic, controlled, and empirical investigation. She has a clear hypothesis, an experimental design that seeks to test that hypothesis, and a way to measure the results objectively, all of which are hallmarks of the scientific method employed in psychology research.