Argument: 'Installing solar panels on the provincial capitol building reduced the monthly electric utility bill by 30%.' Which finding best strengthens the conclusion that the solar panels caused the savings?
Answer and explanation
Correct answer: D. Electricity consumption and utility rates per kilowatt-hour remained steady during the comparative period
- Step 1: To attribute a 30% bill reduction directly to the solar panels, other confounding variables (consumption volume, power grid rates) must be controlled. Step 2. Confirming that utility rates and general electricity usage remained steady ensures that the cost savings were genuinely produced by the solar generation. Answer: Electricity consumption and utility rates per kilowatt-hour remained steady during the comparative period. Why not the others: Turning off air conditioners or grid-wide rate drops provides alternative rival explanations that weaken the conclusion.
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