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

c

Psychology

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The most common hazard to prenatal development is

a. illegal drugs b. miscarriage c. herpes d. alcohol

Psychology

You and your sister are watching your nephew. Initially he seems to be very interested in a stimulus that recently appeared, but seems not to be very interested in it after a few seconds

Your sister thinks that he might not have a very long attention span. What do you tell her? Your nephew is actually displaying ____. a. boredom b. sensitivity c. dishabituation d. habituation

Psychology