Resolving Internal Validity Threats in an Experiment Design
the following scenario:
60 children, ages 3-5, are selected to participate in a
program for developing non-verbal communication skills. The children were
selected on the basis of extremely low scores on a test of non-verbal
communication. After participating in the program, the children are re-tested.
An average improvement of 59% is observed in the quality of non-verbal
communications.
What threat to internal validity is present in this
situation? How can this confound be eliminated?
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