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(D) Five 12. The most common research instrument used is the :(A) Questionnaire(B) Live interviewer(C) Mechanical device(D) Telephone interviewer13. In marketing research, the phase is generally the most expensive and most subject to error.(A) Exploratory research(B) Data collection(C) Planning(D) Data validation14. Which type of research would be best suited for identifying which demographic groups prefer diet softdrinks and why they have this preference?(A) Exploratory research(B) Descriptive research(C) Experimental research(D) Survey research15. Which form of data below can usually be obtained more quickly and at a lower cost than the others?(A) Primary(B) Survey research(C) Experimental research(D) Secondary​

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