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4. a variable whose variation does not depend on that of another.
6. Theory a structured explanation to explain a group of facts or phenomena in the natural world that often incorporates a scientific hypothesis and scientific laws.
8. Participants who do not receive the experimental treatment.
12. the action or process of observing something or someone carefully or in order to gain information.
13. a variable whose value depends on that of another.
15. facts and statistics collected together for reference or analysis.

1. relating to, measuring, or measuring by the quality of something rather than its quantity.
2. a conclusion reached on the basis of evidence and reasoning.
3. a scientific procedure undertaken to make a discovery, test a hypothesis, or demonstrate a known fact.
5. Sentences worded intentionally to gain specific information information.
7. the group in an experiment that receives the variable being tested.
9. a supposition or proposed explanation made on the basis of limited evidence as a starting point for further investigation.
10. relating to, measuring, or measuring by the quantity of something rather than its quality.
11. the available body of facts or information indicating whether a belief or proposition is true or valid.
14. a detailed examination of anything complex in order to understand its nature or to determine its essential features.