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Soren Soren
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8 years ago
The most widely discussed threat to the validity of longitudinal findings is
A)   biased sampling.
B)   selective attrition.
C)   practice effects.
D)   cohort effects.
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Child Development

Child Development


Edition: 9th
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SuperionSuperion
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8 years ago
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Soren Author
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#2
8 years ago
It makes sense now. Thanks a thousand times over
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#3
8 years ago
It was nothing! Don't forget to mark the topic solved
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