Experimental Design Principles
Grade 12 science worksheet on key principles of experimental design, including variables, controls, hypothesis formulation, and data analysis.
Includes
Standards
Experimental Design Principles
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Read each question carefully and provide detailed answers based on your understanding of experimental design principles. Ensure your responses are clear, concise, and demonstrate a strong grasp of the scientific method.
1. Which of the following best describes the purpose of a control group in an experiment?
To provide a baseline for comparison with the experimental group.
To introduce additional variables to the experiment.
To ensure the experiment is conducted ethically.
To manipulate the independent variable.
2. A scientist is testing the effect of a new fertilizer on plant growth. What is the independent variable in this experiment?
The amount of plant growth.
The type of plant.
The new fertilizer.
The amount of sunlight.
3. A scientific hypothesis must be and .
4. The variable that is measured or observed in an experiment is called the variable.
5. Randomization helps to minimize the influence of confounding variables.
True
False
6. A larger sample size always guarantees more accurate results.
True
False
7. Briefly explain the difference between accuracy and precision in experimental data.
8. Describe the importance of replication in experimental design.
9. A researcher wants to investigate if a new type of biodegradable plastic degrades faster in saltwater than in freshwater. Design a simple experiment to test this hypothesis. Include the following:
a. Hypothesis:
b. Independent Variable:
c. Dependent Variable:
d. Control Group/Conditions:
e. At least two controlled variables:
f. Brief outline of the experimental procedure:
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