The ________ phase of marketing research is generally the most expensive and the most prone to error.
A) contact
B) research planning
C) questionnaire design
D) interview design
E) data collection
Answer: E
The ________ phase of marketing research is generally the most expensive and the most prone to error.
A) contact
B) research planning
C) questionnaire design
D) interview design
E) data collection
Answer: E