Information and Ideas: Evidence, Central Ideas, and Inference
What this domain tests
Information and Ideas is about getting information out of a text or graphic and reasoning with it. Core concepts: central idea and summary, command of evidence (which quotation or data point best supports a claim), quantitative reasoning with tables and graphs, and inferences that follow logically from stated information.
Traps to watch for
- The unsupported leap: an inference choice that is plausible in real life but not licensed by the passage.
- The too-broad summary: a main-idea choice that is true of the topic generally but misses this passage's specific claim.
- Evidence mismatch: in paired questions, the best evidence must support the specific answer you chose in the first question, not just the general topic.
- Graph misreads: confusing a change in amount with a change in rate, or reading a legend incorrectly. Check axis labels and units every time.
- Percent vs. percentage points and totals vs. proportions.
Rule of thumb
Treat inference as "must be true," not "could be true." If you cannot point to the words in the passage that force the conclusion, the choice is wrong. For evidence questions, cover the choices and predict what a supporting sentence would need to say.
Worked example
A table shows a town's recycling tonnage rising each year while the share of waste recycled falls. A tempting inference is "residents recycled less." But tonnage rose; only the proportion fell because total waste grew faster. The valid inference concerns proportion, not absolute amount - a distinction the graph is built to test.