Passage Summary: Because power usage moves in lockstep with humidity and this August was more humid on average, the total power usage must have gone up.

Conclusion: Millville consumed more electricity this August than it did last August.

Reasoning: Daily electricity consumption is directly proportional to peak humidity, and the average peak humidity was higher this August than last.

Analysis: The argument uses a mathematical relationship to draw a conclusion about totals based on averages. It establishes that Variable A (electricity) is directly proportional to Variable B (humidity). Since the average of B increased over a set period, the argument concludes the total of A must have also increased. To parallel this, look for an answer that identifies a direct correlation between two factors and uses a change in the average of the independent factor to predict a change in the dependent factor.