Question

question 14
1 pts
when designing an experiment, why do we need to have experimental controls?
reduce the number of controlled variables to ensure the dependent variable is predictable
ensure the biological variability will not influence the results
reduce variability in the results
ensure that changes in the dependent variable depend on the independent variable

Explanation:

Experimental controls are designed to isolate the effect of the independent variable. They rule out alternative explanations for changes in the dependent variable, ensuring that any observed changes can be attributed solely to the independent variable being tested. Other options are incorrect: controls do not reduce controlled variables, they do not eliminate biological variability entirely, and reducing result variability is not their core purpose.

Answer:

Ensure that changes in the dependent variable depend on the independent variable