Information and IdeasHardComparing gains against a control
Information and Ideas practice question
Yield from three plots with the same seed and watering:
Fertiliser X: 4.2 kg
Fertiliser Y: 3.1 kg
No fertiliser: 2.9 kg
A gardener claims that Fertiliser X raised the yield far more than Fertiliser Y did. Which choice most effectively uses data from the table to support the claim?
- A. Compared with the unfertilised plot's 2.9 kg, Fertiliser X added 1.3 kg while Fertiliser Y added only 0.2 kg.Correct
- B. The plot with Fertiliser X yielded 4.2 kg.
- C. The unfertilised plot yielded 2.9 kg.
- D. Both fertilised plots yielded more than the unfertilised plot.
Answer: A. Compared with the unfertilised plot's 2.9 kg, Fertiliser X added 1.3 kg while Fertiliser Y added only 0.2 kg.
The claim compares two GAINS; choice A computes both against the control and shows the gap.
Why the other answers are wrong
- B. The plot with Fertiliser X yielded 4.2 kg.
- One yield, no comparison of gains.
- C. The unfertilised plot yielded 2.9 kg.
- The baseline alone.
- D. Both fertilised plots yielded more than the unfertilised plot.
- True, but it doesn't say X gained far more than Y.
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