A questionnaire must be clearly written so that all respondents interpret the questions in the same way, thus ensuring questionnaire reliability. True False Question 12 ( 1 point) What is the primary focus of marketing research? obtaining information about customers' preferences, opinions, and habits obtaining information about a business's current success in satisfying its customers determining the effectiveness of a business's advertising analyzing a business's management and operations Question 13 (1 point) The Internet is a good source of secondary data. True False