Control group

Choose the right comparison.

How it works

The control is the same in everything except the factor being tested.

• 30 progressive levels, from basic to advanced
• Levels 1 to 3 free, no card

More exercises in Scientific thinking

• Hypotheses
• Variables
• Fair test
• Correlation vs cause
• Graphs
• Measurement
• Probabilistic thinking
• Diagnosis
• Scientist mission