| Term | Definition | Example (Plant Growth Experiment) | | :--- | :--- | :--- | | | What the experimenter changes on purpose. | Amount of water per day. | | Dependent Variable (DV) | What is measured as the result. | Height of the plant. | | Control Group | The group that gets no treatment (baseline). | Plant receiving 0mL water (or standard amount). | | Constant | Factors kept the same across all trials. | Same soil, same pot size, same light. |
"When the subject consumed caffeine, their running speed was 15% faster compared to the trial without caffeine. However, testing must be repeated on multiple subjects to confirm." Fundamentals Of Experimental Design Pogil Answer Key
(1) Same size/brand of Alka-Seltzer tablet. (2) Same volume of water. (3) Same container shape. | Term | Definition | Example (Plant Growth
External parameters kept identical across all test setups to prevent data contamination. Control Group vs. Controlled Variables | Height of the plant
If asked how to improve the experiment, suggest multiple trials (replication) or tighter control of environmental variables.
Look at the data table; any column where the value is the same across all trials (e.g., "1 atm pressure") is a controlled variable.
