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
Question 2Suppose that the presence of a particular gene is a necessary cause for the occurrence of schizophrenia. Which of the following statements is TRUE?
a. The gene is also a sufficient cause for the occurrence of schizophrenia.
b. There are other things besides this gene that can cause schizophrenia.
c. Most people with schizophrenia will have that gene.
d. A person with that gene may or may not become schizophrenic.
Question 3If having a gene for Parkinson's disease guarantees that Parkinson's disease will develop, the presence of the gene can be described as a
a. risk factor.
b. necessary cause.
c. sufficient cause.
d. contributory cause.
Question 4Compared with girls, boys are more likely to be diagnosed with autism spectrum disorder.
Indicate whether the statement is true or false
Question 5Which of the following is an example of an ABAB design?
a. Half of the subjects receive one treatment and the other half are not treated.
b. All subjects received one of two treatments.
c. A subject is observed and treated.
d. A subject is observed both before and after two exposures to the treatment.
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