What is the term for a standard of comparison that remains unchanged in an experiment?

What is the term for a standard of comparison that remains unchanged in an experiment?

• A. Control
• B. Constant
• C. Mixture
• D. Solvent

Answer: (A)

In experiments, you need a standard of comparison that stays the same so you can tell if the treatment really caused a difference. This standard is the control. It provides a baseline, and you compare the results from the changed conditions to this baseline while keeping all other factors constant. That way, any observed change can be attributed to the variable you changed, not to other influences. A constant is simply something kept the same across the experiment, but it isn’t itself a separate baseline used for comparison. Mixture and solvent describe substances, not a comparison standard in experimental design. For example, in a plant growth test, the control group would receive no fertilizer while all other conditions are identical; any difference in growth can be linked to the fertilizer.

In experiments, you need a standard of comparison that stays the same so you can tell if the treatment really caused a difference. This standard is the control. It provides a baseline, and you compare the results from the changed conditions to this baseline while keeping all other factors constant. That way, any observed change can be attributed to the variable you changed, not to other influences. A constant is simply something kept the same across the experiment, but it isn’t itself a separate baseline used for comparison. Mixture and solvent describe substances, not a comparison standard in experimental design. For example, in a plant growth test, the control group would receive no fertilizer while all other conditions are identical; any difference in growth can be linked to the fertilizer.