Question

A study included 60 people suffering from an ordinary headache. Twenty received aspirin, 20 received a sugar pill that looked like aspirin, and 20 got nothing at all. In 65 percent of the aspirin group, the headache disappeared. In the other two groups the "cure" rates were 35 and 5 percent, respectively. Other than the drug condition, the participants were treated identically. This study:

a. demonstrates a double-blind designb. is an experimental studyc. contains an important confoundd. has three dependent variables

Answer 1

b. is an experimental study

Step-by-step explanation:

Experimental studies are characterized by artificial manipulation of the intervention by the researcher, administering an intervention and observing its effect on the outcome. The study shown in the question can be considered an experimental study because the researcher handled the intervention different medical treatments for people with the same headache, administered these treatments and observed what effect each treatment had on each patient, establishing what the relationship was. between outcome and treatment.