The only way to address threats to internal validity is via random assignment.
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Q6: Issues of cause and effect are closely
Q7: When some event other than the program
Q8: When a significant number of subjects drop
Q9: When the tests (or observers)used on the
Q10: In design notation,the letter R stands for
Q12: An instrumentation threat occurs when taking the
Q13: Temporal precedence means the effect occurs before
Q14: The threat to validity that occurs as
Q15: Quasi-experimental designs use random assignment.
Q16: The statistical phenomenon that causes a group's
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