Ron is running an experiment to see if certain sounds can improve memory. while testing the subjects’ memory, ron unintentionally smiles when the subjects seem to be arriving at the proper answer. his smile the subject pick the correct answer. in this case, ron is showing a. experiment effect. b. invalid experimental placebos. c. informed consent. d. experimental bias.

Answer

D.Experimental bias

Explanations

Experimental bias occurs when a scientist performing a research influence the results in order to portray a certain outcome.In this case,Ron unintentionally smiled when then subject was showing to act as expected.In doing so,"smiling" the subject was able to identify the correct answer.

answer; ///(gordon allport)

i believe it is a. a segment : )