Which type of problem is shared by the placebo control method and the withdrawal design method?
a. Lack of control of the independent variable
b. Ethical concern of withholding treatment from those who need it
c. Ethical issue of tricking people into thinking that they will get better
d. The fact that the individual will likely respond to the unique circumstances of the research setting
Question 2
The function of replication in research is to
a. better define independent and dependent variables.
b. improve the research design.
c. rule out coincidence.
d. enhance the internal validity of the study.
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