A fair test is a type of scientific investigation where only one factor (the independent variable) is changed. All other conditions (controlled variables) are kept the same. This ensures that any changes observed are caused by the one factor being tested. It's like baking cookies – if you change the amount of sugar but keep everything else the same, you can be sure that any difference in the cookies is due to the sugar.
Planning a fair test involves identifying the independent variable, dependent variable (what you measure), and all the controlled variables. Think of it as setting up a race where everyone starts at the same place and only one runner gets to wear special shoes!
Match the terms with their definitions:
| Term | Definition |
|---|---|
| 1. Independent Variable | A. What you measure in an experiment. |
| 2. Dependent Variable | B. Factors that are kept the same during an experiment. |
| 3. Controlled Variables | C. A test where only one factor is changed. |
| 4. Fair Test | D. The factor you change in an experiment. |
| 5. Hypothesis | E. An educated guess about what will happen. |
Match the correct letter to the term:
Fill in the missing words to complete the sentences:
In a fair test, we only change one __________. We keep all other __________ the same. The thing we measure is called the __________ __________. A fair test helps us understand how things __________.
Imagine you are testing which type of fertilizer helps plants grow tallest. Describe how you would set up a fair test. What would you change? What would you keep the same?
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