A therapist wants to study the effects of yoga and Which of the following is the best description of the
meditation on stress relief. She has 60 volunteers who
experimental design?
experience varying levels of stress. She believes that
the volunteers' professions could have an effect on the
O observational study
results, A preliminary survey reveals that 22 of the
O matched pairs design
volunteers are in high-stress professions. The therapist
randomly assigns 11 of these sübjects to practice
O randomized block design
yoga and the remaining 11 to practice meditation.
© completely randomized design
Nineteen of the other 38 volunteers are randomly
assigned to practice yoga and the remaining 19 to
practice meditation. Before the experiment begins, all
the participants will be asked to rate their stress levels
on a scale of 0 to 10, with 0 representing "no stress"
and 10 representing "highest level of stress." At the
end of one month, the subjects will be asked to rate
their stress levels again. The differences in stress levels
will be compared for the different stress-relieving
activities within the two types of professions.