Scientific Investigation and Experiments

## The Building Blocks of Science All scientific discoveries start with experiments! On the ACT, you'll read about how scientists design and carry out investigations. ### Parts of an Experiment - **Hypothesis:** What are they trying to prove? - **Variables:** What do they change, and what do they measure? - **Control:** What stays the same to make the test fair? ## Using This Knowledge Knowing how experiments work helps you judge the reliability of results—useful for both test questions and real-world decision-making, like evaluating product claims. ### Look Out For - Flaws in experiment design - Logical conclusions based on the data