which of the following must remain the same for all trials of this experiment?
Which of the following must remain the same for all trials of this experiment?
Answer: In any experiment, the factors that must remain the same for all trials are called controlled variables or constants. These are essential to ensure that the results of the experiment are reliable and that any observed changes in the dependent variable are solely due to the manipulation of the independent variable.
Key Elements of Controlled Variables:
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Definition: Controlled variables are conditions or factors that are kept consistent throughout all trials. This helps maintain the integrity and reliability of experimental results.
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Purpose:
- To isolate the effects of the independent variable.
- To ensure that any changes in the dependent variable can be attributed specifically to the independent variable.
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Examples:
- Temperature: If you’re testing the effect of a fertilizer on plant growth, the temperature in which the plants are kept should remain constant.
- Light Exposure: The amount of sunlight or artificial light should not vary between trials.
- Measurement Timings: The intervals at which measurements are taken should be consistent for each trial.
Identifying Controlled Variables:
- Consider what factors might influence the outcome of your experiment.
- Determine which of these factors could be kept constant throughout all trials.
- Implement procedures to ensure these remain unchanged.
Why It’s Important:
By maintaining controlled variables, you reduce the risk of other variables skewing your results and ensure that your experiment tests only the specific changes you are interested in assessing.
Summary: Controlled variables must remain constant across all trials of an experiment to ensure valid and reliable results. They help isolate the effects of the independent variable on the dependent variable, eliminating other potential sources of variation.