LEVEL 08 · LESSON 07
Designing a small comparison
See it
A useful experiment changes as little as possible while comparing a clearly defined variable. Replication, randomization where practical, consistent handling, predefined outcomes, and complete records make the result more interpretable.
Understand it
State the question before running the experiment.
Define the variable being changed and the variables being held constant.
Choose outcome measures before seeing the result.
Important boundary
Changing several ingredients at once makes it hard to know what caused the outcome.
Try it
Explain the concept in your own words, then identify what plant, explant, stage, units, source, or observation context would need to be preserved before applying it.
Lesson quiz
Apply it
Connect this lesson to an actual MyTCLab record: what fields would you need in order to know later exactly what happened and why?