How could the sample selection procedures used in a research study investigating the levels of depression occurring in blind and sighted adolescents make the sample of blind adolescents more homogeneous?
a. Eliminate subjects taking prescription medications
b. Narrow the age range of subjects to those between 13 and 18 years
c. Have the same person administer the questionnaire to all subjects
d. Avoid telling the subjects the nature of the study
ANS: A
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A Because many potential subjects take prescription medications, elimination of subjects taking prescription medications would make the sample homogeneous.
B Narrowing the age range of subjects in an adolescent study would not necessarily increase homogeneity.
C Having the same data collector would not alter the nature of the sample.
D Not sharing the nature of the study with subjects would not alter sample characteristics.
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