Brian conducts a study to examine the ability of boys and girls in solving difficult mathematical problems. He expects girls to perform much better than boys and communicates his expectation to the participants in a subtle manner. This is an example of:

a. research participant bias.
b. experimenter bias.
c. placebo effect.
d. double-blind experiment.

The correct answer is b. experimenter bias.

Explanation:

Observer bias occurs when the actions of an investigator influence the results of a trial. Experimenter bias are involuntary and occur when an investigator or an observer they communicate to the subjects in a subtle way the behaviors they expect; thereby prompting early reaction. Experimenter bias can modify the observation in the sense of causing errors in the data from the observations.

2b2t

explanation:

2b2t