The one threat to internal validity that the "classic" experimental design cannot control is:
A)attrition due to voluntary quitting.
B)history that results from things external to the experimental setting.
C)maturation on the part of the experimental subjects.
D)testing that results from weaknesses in the measurement devices.

Question

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The Answer of The one threat to internal validity that the "classic" experimental design cannot control is:
A)attrition due to voluntary quitting.
B)history that results from things external to the experimental setting.
C)maturation on the part of the experimental subjects.
D)testing that results from weaknesses in the measurement devices.

The One Threat to Internal Validity That the "Classic" Experimental