Question
A study is planned to research the effects of drinking coffee on hours of sleep. Would an experimental or observational study design be more appropriate?
Select the correct answer below:
- An observational study should be used because it is not possible to control whether or not a person drinks coffee.
- An observational study should be used because it is not possible to control the number of hours of sleep a person has.
- An experimental study should be used where the consumption of coffee is the experimental factor.
- An experimental study should be used where the number of hours of sleep is the experimental factor.
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