Social Variables Tammy's experiment compared the effectiveness of videotape and textbook presentation of a history lesson.Unexpectedly, her demeanor changed with each treatment condition.She appeared worried during the videotape condition because the audiovisual equipment periodically broke down.In contrast, she seemed relaxed in the textbook condition during which subjects read from a book.Which problem does this illustrate?
A)confounding by a context variable
B)experimenter bias
C)history threat
D)selection threat

Question

Quizplus · Accepted Answer

This illustrates experimenter bias, as Tammy's behavior and demeanor varied between the two conditions and may have influenced the results of the experiment.

Social Variables Tammy's Experiment Compared the Effectiveness of Videotape and Textbook