One advantage of open-ended questions is that

a. they are more objective than closed questions.
b. are easier for researchers to quantify and analyze than closed questions.
c. help researchers understand an issue in more depth than closed questions.
d. restrict respondents to rating scales and multiple choice.
e. are more frequently used in surveys than closed questions.

Total marketing effort is a term used to describe the critical decision factors that affect demand: price, advertising, distribution, and product quality. define the variable x to represent total marketing effort. a typical model that is used to predict demand as a function of total marketing effort is based on the power function: d = axb suppose that a is a positive number. different model forms result from varying the constant b. sketch the graphs of this model for b = 0, b = 1, 0< b< 1, b< 0, and b> 1. (we encourage you to use excel to do this.) what does each model tell you about the relationship between demand and marketing effort? what assumptions are implied? are they reasonable? how would you go about selecting the appropriate model?