To test the effect of background music on class performance,Professor Jones plays soft background music for his introductory class and no music for his advanced class.He counts the number of "intelligent questions" in each class and reports more in the class with music.What are the two things wrong with this experiment?
A)Lack of an independent variable and lack of demand characteristics
B)Lack of a control group and lack of a dependent variable
C)Lack of random assignment and lack of blind observations
D)Lack of a hypothesis and lack of a correlation

Question

To test the effect of background music on class performance,Professor Jones plays soft background music for his introductory class and no music for his advanced class.He counts the number of "intelligent questions" in each class and reports more in the class with music.What are the two things wrong with this experiment?​
A)Lack of an independent variable and lack of demand characteristics
B)​Lack of a control group and lack of a dependent variable
C)​Lack of random assignment and lack of blind observations
D)​Lack of a hypothesis and lack of a correlation

Quizplus · Accepted Answer

The experiment lacks random assignment, meaning that the professor did not randomly assign students to each condition (either the class with music or the class without music). Also, the observations lack blind observations, meaning that the students were aware of which condition they were in (with or without music) and this knowledge may have biased their responses. The other options are not relevant to the issues with this experiment.

To Test the Effect of Background Music on Class Performance,Professor