What makes an experimental design a "true" experimental design?
A) There are no "false" variables.
B) It truly isolates the effects of the independent variable on the dependent variable while controlling for effects of any extraneous variables.
C) It is performed by a certified marketing researcher.
D) both A and C
E) none of the above
Answer: B) It truly isolates the effects of the independent variable on the dependent variable while controlling for effects of any extraneous variables.