Praxis General Science 5436 Practice Test 2026 | Exam Prep Questions

Why is a negative control group essential when testing the efficacy of a new chemical water purifier?

To ensure the independent variable is maximized in every test tube To establish a baseline measurement in the absence of the active purifying agent To guarantee that all experimental samples produce identical quantitative results To eliminate the need for repeating experimental trials

Correct Answer:

To establish a baseline measurement in the absence of the active purifying agent

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