A biologist is interested in finding the relationship between the amount of sunlight and the growth rate of sunflowers. Would an experimental or observational study design be more appropriate?
Select the correct answer below:
- An experimental study should be used with the growth rate of the sunflowers as the controlled factor.
- An observational study should be used because the amount of sunlight cannot be controlled.
- An experimental study should be used with the amount of sunlight as the controlled factor.
- An observational study should be used because the growth rate cannot be controlled.
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