Use the following information for questions:
43 sedentary adults between the ages of 50 and 76 were randomly assigned to either an exercise program four times a week for 16 weeks or they continued to be sedentary (King, et al, JAMA, January 1, 1997,pp 32-37). The exercise group slept an average of 42 minutes a night longer than the control group.
-Can a conclusion that the exercise program caused more sleep?
A) A cause and effect relation might be concluded because the study had a control group.
B) A cause and effect relation might be concluded because the study was a randomized experiment.
C) A cause and effect relation cannot be concluded because the study was an observational study.
D) A cause and effect relation cannot be concluded because diet was not controlled.

Question

Use the following information for questions:
 43 sedentary adults between the ages of 50 and 76 were randomly assigned to either an exercise program four times a week for 16 weeks or they continued to be sedentary (King, et al, JAMA, January 1, 1997,pp 32-37). The exercise group slept an average of 42 minutes a night longer than the control group.
-Can a conclusion that the exercise program caused more sleep?
A) A cause and effect relation might be concluded because the study had a control group.
B) A cause and effect relation might be concluded because the study was a randomized experiment.
C) A cause and effect relation cannot be concluded because the study was an observational study.
D) A cause and effect relation cannot be concluded because diet was not controlled.

Quizplus · Accepted Answer

A cause and effect relation might be concluded because the study was a randomized experiment. Random assignment of participants to either the exercise program or the control group helps to ensure that any differences observed (such as the average increase in sleep duration) are due to the intervention itself rather than other variables.

Use the Following Information for Questions