LEARN MISSIONexperimental design, analysis, and scientific argument
experimental design, analysis, and scientific argument
WORKED MODELWORKED SOURCE
Design a fair salinity test
Question: How does salinity affect radish germination? Proposed groups receive 0%, 0.5%, 1.0%, and 1.5% salt, with 40 seeds each; light, temperature, water volume, and seed lot are held constant.
Independent variable: salinity.
Outcome: germination proportion after a fixed time.
Replication occurs within each group.
Which feature most directly supports causal comparison?