Design an experiment using a t-test to compare the effectiveness of two different fertilizers on plant growth, where one fertilizer is a known standard.

• A. Calculate the median growth for each fertilizer and compare.
• B. Use a z-test to compare the means of plant growth.
• C. Measure plant growth with both fertilizers, calculate the means, and use a t-test to compare.
• D. Measure plant growth with both fertilizers and compare the variances.

Answer: (C)