– Factors kept the same for all groups to ensure a fair test (e.g., same light, water, soil type).
💡 An experiment is only valid if it is a fair test. If you change more than one variable at a time, your data becomes meaningless. fundamentals of experimental design pogil answer key
Every experiment starts with a "Why" or "How." – Factors kept the same for all groups
– Assigning subjects to groups randomly to avoid bias. fundamentals of experimental design pogil answer key