7.下列那個變項的出現,使得其研究無法以操弄獨變項(independent variable)來解釋依變項(dependent variable)之變化?
(A)刺激變項(stimulus variable)
(B)介入變項(intervening variable)
(C)混淆變項(confounding variable)
(D)潛在變項(latent variable)

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統計: A(0), B(10), C(606), D(28), E(0) #2969241