To test the effectiveness of changes in a package design, a marketing research firm decides to implement certain changes in Houston, other changes in Dallas, and no change to the package design in San Antonio. With regard to the products in question, the purchasing propensities in the three cities are equal. What type of research design is the marketing research firm invoking? O descriptive study design ob exploratory study design O case study design Od causal study design O e secondary research design Which of the following is not an example of exploratory research techniques? O a Focus Group Interview Ob Secondary data analysis O Case studies d. Experiments O e. Pilot studies Which of the following is not an advantage of depth interviews over focus groups? O a. always get more honest responses in privacy-sensitive issues Ob.group pressure is eliminated Ocheightened attention of respondents Od. no need for expensive focus group facility e all of these are advantages of depth interviews over focus groups