A is an attempt to directly measure whether the independent variable manipulation has the intended effect on the participants. placebo effect manipulation check staged manipulation ceiling effect

manipulation check                                

Explanation:

Manipulation check: In research methods, the term "manipulation check" is described as a test that is being used to determine the "effectiveness" of a specific manipulation in any of the experimental designs. In other words, the manipulation check refers to the specific kind of "secondary evaluations" in a particular experiment. It is often considered as "measured variables".

In the question above, the given statement signifies the manipulation check.

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