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Soren Soren
wrote...
Posts: 4016
8 years ago
A major problem with systematic observation is 
A)   practice effects.
B)   selective attrition.
C)   biased sampling.
D)   observer influence.
Textbook 
Child Development

Child Development


Edition: 9th
Author:
Read 102 times
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Answer verified by a subject expert
iHomeiHome
wrote...
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Posts: 3632
8 years ago
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Soren Author
wrote...
8 years ago
Wow, thank you.
wrote...
8 years ago
Happy to help.
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