A control group is important in an experiment for which of the following reasons?

• A. To provide a baseline for comparison with the experimental group
• B. To increase the sample size of the experiment
• C. To ensure that the experiment is conducted in a controlled environment
• D. To eliminate all variables from the experiment

Answer: (A)

Verified step by step guidance

1. Understand the purpose of a control group in an experiment: A control group is used to provide a standard of comparison for the experimental group. It helps in determining the effect of the independent variable being tested.
2. Identify the role of a control group: The control group is not exposed to the experimental treatment or the independent variable, allowing researchers to isolate the effects of the independent variable on the experimental group.
3. Consider the options provided: Evaluate each option to determine which one aligns with the purpose of a control group.
4. Option analysis: 'To provide a baseline for comparison with the experimental group' is the correct reason for having a control group, as it allows for a comparison to see if the independent variable has any effect.
5. Conclude the reasoning: The other options do not accurately describe the primary purpose of a control group. Increasing sample size, ensuring a controlled environment, or eliminating variables are not the main reasons for having a control group.