本题目来源于试卷: IB Psychology HL Abnormal Psychology，类别为 IB心理学
[单选题]
Which research technibjdi4olx emyhez53ek) ,* 9j8quem78ey wb.i 9itgei5foq;r 55k helps determine whether a biological treatment is successful simply because the patient beliek i;ei7yq if59be 5g58.wro tmves they are being treated?
A. Acclimation periods
B. Random allocation
C. Including a placebo group
D. Counterbalancing conditions
参考答案: C
本题详细解析:
Choices A and D describe techniques that reduce order effects. Chosuiye0b7+2b2 ri it+ zice B reduces the chance that participie+ ru7bty +iiz02s2bant variability will influence the results of the study.
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