Which of the following must be controlled in research on perception?
a. the motivation of the observer
b. the emotional content of the material presented to the observer
c. the physical characteristics of the stimulus that are not being investigated
d. all of these
D
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While having a gene for Parkinson's disease guarantees that Parkinson's disease will develop, this is not the only factor that can lead to Parkinson's disease. In other words, the presence of the gene is a __________, but not a __________.
A. risk factor; sufficient cause B. sufficient cause; necessary cause C. necessary cause; risk factor D. contributory cause; sufficient cause
One of the reasons that researchers will often use an existing questionnaire rather than designing their own is
a. To minimize history as a threat to internal validity b. In situations where the purpose of the questionnaire is poorly defined c. To be able to compare their results to others who have used the survey d. In situations where the variables of interest are unclear
The more "committed" the brain is to native-language patterns, the
A) better children's mastery of their native language. B) more effectively children acquire foreign language. C) more difficult it is for children to acquire reading skills. D) greater the chance the child is ambidextrous.
Suppose I want to know whether wearing a suit versus jeans when I lecture makes a difference in student learning. For my fall-semester class I always wear jeans when I lecture and for my spring-semester class I wear a suit. I then compare the grades for the two classes to determine whether there is a difference in performance. I have conducted what type of research?
A) a nonexperiment B) a quasi-experimental design C) an experiment D) a baseline design