Multiple Choice
Worker productivity is assessed before and after a program for flextime is instituted. Just after the pretest, workers receive an unexpected bonus check based on unusually high product sales. Productivity is higher on the posttest than on the pretest, but the researcher suspects ______ as a threat to internal validity.
A) history
B) regression
C) instrumentation
D) selection
Correct Answer:
Verified
Correct Answer:
Verified
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