Soal SMA · Soal cerita · Kesulitan 4/5
A researcher claims that a new fertilizer increases crop yield. In a field trial, plots with the fertilizer yielded 10% more than plots without. However, the fertilized plots were also closer to a water source. What should the researcher do to strengthen the conclusion?
- A.Repeat the experiment with random assignment of fertilizer to plots, ensuring equal access to water.
- B.Apply more fertilizer to see if yield increases further.
- C.Measure the water content of the soil.
- D.Conclude that the fertilizer is effective because the yield was higher.
Kunci jawaban & pembahasan
Jawaban: Repeat the experiment with random assignment of fertilizer to plots, ensuring equal access to water.
Random assignment and controlling water access would eliminate the confounding variable, allowing a clearer test of the fertilizer's effect.
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