Multiple Line Graphs — Mains Strategy

Mains Strategy

This is written data-reasoning practice, not a descriptive CSAT paper. Open by naming the series, units and period under comparison. State whether the answer concerns a level, an absolute change, a percentage change or an average rate per unit time. That choice determines the calculation that follows.

In the body, extract the relevant endpoints and show the denominator and elapsed interval. Explain why unequal intervals require normalisation before comparing average rates. If the data are indexed, distinguish relative movement from original quantities. Where the graph connects observations without intermediate measurements, identify any interpolation assumption rather than presenting an estimate as an observed fact.

Conclude with the comparison and its scope. A valid answer might say that one series increased faster in percentage terms while remaining smaller in level. Another might report that the exact crossing date is undetermined. These conclusions are more precise than a broad statement that one line 'performed better', which can hide an unspecified metric and unsupported interpretation.