Question: ? ? ? ? ? ? ? ? ? ? ? s u r v e y s a r e u s u a

???????????surveysareusuallybiasedbecausethosemostlikelytorespondarethosewhohavehadespeciallypositiveornegativeexperienceswiththeproductorbrand.
a
Mail
b
Fax
c
Personal interview
d
Telephone
e
Online

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