Make a fair plant comparison
Identify a changed variable, measured outcome and limit of a small study.
Open lesson 1Variation, controls, and scientific claims
Evaluate small comparisons using means, variation, and fair design.
Before you begin
- Calculate a mean; subtract starting from final measurements; distinguish a variable from an outcome.
Choose by skill rather than age alone. Read with an adult when useful, revisit a lesson, or explore another grade.
Follow the lesson sequence
Compare Means and Variation
Use a range and overlapping results alongside group means.
Open lesson 2Spot Two Changes at Once
Explain why a design cannot isolate the tested factor.
Open lesson 3Plan a Replication and Report Its Scope
Specify a repeatable comparison and revise a claim with new results.
Open lesson 4Review and transfer
After the lessons, try 4 new review cases and a practical task. Each answer has an explanation and a link back to the related lesson.
Open the unit reviewGuest answers are temporary. Keep your own paper or document; this unit does not certify completion or record a school grade.