Question

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which of the following statement(s) best defines an experimental investigation?
a type of investigation where two or more things are being studied and described.
a type of investigation that is conducted under controlled conditions in which a variable is identified.
a type of investigation performed by observing something in its natural environment.
a type of investigation performed by observing something in its natural environment and comparing two or more things.

Explanation:

• The first option describes a descriptive investigation (studying and describing), not experimental.
• The second option: Experimental investigations involve controlled conditions and identifying variables (like independent, dependent variables) to test hypotheses. This matches the definition of an experimental investigation.
• The third and fourth options describe observational investigations (observing in natural environment, with or without comparison), not experimental.

Answer:

B. A type of investigation that is conducted under controlled conditions in which a variable is identified.