trendThe overall way a set of numbers changes over time or across groups, such as rising, falling, or staying flat.
You’ll leave with these skills
01Tell whether a study was set up to show a causeCheck the comparison group, assignment method, and other conditions to judge whether the study can distinguish a treatment's effect from other explanations.
02Tell an experiment apart from a study that only observesCheck whether researchers changed a condition or observed existing conditions, remembering that experiments can also use surveys.
03Explain why an improvement since last year doesn’t prove the new treatment workedWhen the only comparison is with last year, pick the choice that says something else could have changed since then.
This lesson is part of the full library
207 lessons that teach every skill the SAT tests
71Math
40Reading
24Grammar
10 full-length practice tests to build test-day stamina and confidence
A Desmos simulator to solve math questions faster
A step-by-step guide to every practice test question
The Bluebook Simulator, so test day feels familiar
A drawing for every key term, so new ideas make sense at a glance
