A sales training firm wants feedback on the quality of its classes and training services. The firm planned to send mail surveys to CEOs of it's client companies to get the needed information. However, one executive objected to the survey plan, saying, "CEOs don't attend our classes. How will they know if the classes are any good?" Another executive added, "If the survey isn't relevant to the CEOs, it will be thrown away and we'll get no data." It appears that the research design presents problems with:
a. response rate.
b. relevance of population.
c. validity.
d. improper statistical analysis.
e. both A and B.
Answer: e. both A and B.