Question

which of the following is the purpose of using an operational definition?
multiple choice
experimenter bias is eliminated with the use of an operational definition
research participant bias increases when a study uses an operational definition
internal validity becomes unnecessary when a study has an established operational definition
establishing an operational definition ensures that everyone agrees on what a variable means

Explanation:

Operational definitions define variables with measurable, clear criteria, creating shared understanding among researchers and participants. The other options are incorrect: operational definitions reduce (not eliminate) experimenter bias, reduce participant bias, and internal validity remains critical even with them.

Answer:

D. Establishing an operational definition ensures that everyone agrees on what a variable means.