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3. Strategy for the Hardest Items
GED® Science: Full-Length Practice Exam (Level 3 - Expert) · preview lesson
- Show the calculation. Write the formula, plug in the numbers, and check the units.
- Predict the trend. On a graph, decide what should happen before reading the answer choices.
- Separate cause from coincidence. A correlation needs a controlled experiment before you can claim causation.
- Judge the design. Ask whether the study had a control group, a large enough sample, and only one variable changed.
- Estimate to catch errors. A rough check flags a misplaced decimal.
Quick Check
To claim that one thing CAUSES another, an experiment must change how many variables at a time?
Change only one variable so you can attribute the effect to it.
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