PJ conducts an experimental study on the effects of soft music during high stakes science testing. He randomly assigns students at the school. In one condition he does not provide music for testing while in the other group he does provide the music. One concern in his study is that during the year the music teacher at the school he administered the study shared with students the physiological benefits of soft music. The introduction of the benefits of music during the duration of his study can be considered which of the following threats?
A) History
B) Maturation
C) Mortality
D) Testing

Question

Quizplus · Accepted Answer

The introduction of the benefits of music during the study can be considered a history threat, which involves external events or factors that may influence the outcome of the study. Specifically, the introduction of the benefits of music by the music teacher could have influenced the students' beliefs or expectations about the effects of music, which in turn could have affected their performance on the science test.

PJ Conducts an Experimental Study on the Effects of Soft