Researchers choose their subjects by random selection because:
a. in random selection, there is a positive correlation between subjects
b. it is a tradition that goes back to the days of Wilhelm Wundt‘s psychology lab
c. this method guarantees that the more motivated subjects will be selected
d. only this method guarantees an equal chance of being selected for the experiment
D
Psychology
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Most elderly siblings
A) visit each other less than once a year. B) live more than 100 miles from each other. C) communicate with each other regularly. D) provide one another with direct assistance.
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