MARKET RESEARCH 38
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What is the name of the threat that indicates that taking a pretest may affect perfomance of a postest?
Suppose an experimental group is bein g taught letters of the alphabet as a treatment. At about the same time, the students are watching an educational program on television, from which they learn the names of the letters. What is the name of the threat that this problem illustrates?
If observers are more tired and less astute when making postest observations than when making pretest observation, what threat is operating?
What is the name of the threat posed by nonrandom assignment of participants to experimental and control groups?
If infants naturally improve in visual acuity and thus perfom better at the end of an experiment than at the beginning, what threat is operating?
Under what circumstance will statistical regression operate?
when participants are selected on the basis of their extreme scores
How can researchers overcome all the threats to internal validity
true experimental design
What would you like to do?
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