Use the following scenario to answer questions 33 and 34. D…
Use the following scenario to answer questions 33 and 34. Dr. Ruscher is interested in stress and public speaking. She randomly selects 20 college students and 20 nonstudents to be in her study. The college student participants give a 10-minute presentation on the French Revolution, and the nonstudent participants read a book about the French Revolution for 10 minutes. Dr. Ruscher then measures all participants’ cortisol levels and finds that the presentation group has a higher average cortisol level than the control group. Dr. Ruscher concludes that public speaking causes stress.