easy · Enhanced ACT science
A scientist hypothesizes that higher levels of nitrogen in soil lead to taller sunflowers. She compares sunflowers in soil with 5% nitrogen to those in soil with 10% nitrogen. However, the 10% nitrogen group was also watered twice as often.
Why does this design fail to support the hypothesis?
- The nitrogen levels are not extreme enough
- The study should have used 0% nitrogen
- Water frequency has become a confounder
- Because nitrogen is a difficult factor to add
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