A statement describing how a researcher manipulates an independent variable is known as a(n)

A) control condition.
B) replication.
C) operational definition.
D) hypothesis.

An operational definition is a statement that describes how a researcher manipulates an independent variable. It is a precise description of how the variable will be measured or manipulated in the study. A control condition is a group in an experiment that does not receive the treatment being tested. Replication refers to repeating an experiment to see if the results can be reliably reproduced. A hypothesis is a testable prediction about the relationship between variables.