Many surveys are conducted over the phone.Which of the following would be most likely to cast doubt on the external validity of these studies?
A) The person conducting the survey was not good at operating a telephone.
B) Some of the calls were dropped and the person had to be called back.
C) The phone surveys were conducted by 12 surveyors instead of one.
D) All of the people participating in the survey own telephones.
E) The phone calls were not all placed at the same time of day.
Correct Answer:
Verified
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