The text considered several plausible explanations for the failure of the Cambridge-Somerville project on preventing youth from going down a criminal path. What was one explanation that was suggested?
a. The project did not include a control (comparison) group.
b. Community sources of help (e.g., social services organizations) did not provide typical levels of support.
c. Problems of attrition—the least delinquent-prone boys dropped out—biased the outcomes in a negative direction.
d. The absence of a long-term follow-up meant that more subtle beneficial outcomes that might eventually emerge could not be examined.
Ans: B
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