first part of the paper (minimum 120 words) please you reference
page 1
Consider 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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