Question Five: A Selecting the research problem is the most difficult and important step in the research process - Why is it necessary to dene a problem and delimiting a problem? - Discuss characteristics of good problem and criteria for evaluating a problem. 13- A specialty retail firm hires a business researcher. The retailer is trying to decide what level of ghting and what temperature it should maintain in its stores to maximize sales. How can the researcher manipulate these experimental variables within a causal design