Praxis 5511 Practice Question
Why are control groups important?
Correct Answer: D
Rationale: Control groups are essential in experiments as they help ensure that any observed changes in the experimental group are directly due to the treatment applied, rather than other factors. This establishes a clear cause-and-effect relationship.
Option A is incorrect because control groups do not test multiple variables; they isolate one variable for accurate measurement. Option B is misleading, as control groups do not reduce the number of objects needed but rather provide a baseline for comparison. Option C is also inaccurate, as control groups primarily focus on experimental validity rather than cost management.
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