In evaluating how effective an anti-bullying program in a school is,Iori asks students how many times they have been bullied in the past four months at the beginning and middle of the semester.However,since he did not use a control group,what form of invalidity may be a problem?
A) compensation.
B) maturation.
C) statistical regression.
D) experimental mortality.
E) causal time order.

Question

Quizplus · Accepted Answer

Maturation is a form of invalidity that occurs when changes in the participants' behavior are due to natural maturation processes rather than the intervention being tested. Without a control group to compare the results to, it is impossible to determine if any changes in the bullying frequency reported by the students are due to the anti-bullying program or maturation. Compensation refers to the phenomenon in which participants try to please the experimenter or compensate for the intervention, but this is not relevant to this scenario. Statistical regression describes when extreme scores tend to regress towards the mean in subsequent measurements, but again, this is not relevant. Experimental mortality refers to participants dropping out of the study or being lost to follow-up, which is also not a concern in this scenario. Causal time order refers to the requirement that the cause must precede the effect, which is not relevant in this case.

In Evaluating How Effective an Anti-Bullying Program in a School