Refer to the Journal of Productivity Analysis (Vol. 35,2011) study of how successful NFL teams are in drafting productive quarterbacks, Exercise 1.16 (p. 25). Recall that the researchers measured two variables for each of the 331 quarterbacks drafted between 1970 and 2007: (1) Draft position (Top 10, between picks 11-50, or after pick 50) and (2) QB production score (where higher scores indicate more productive QBs). Suppose we want to compare the mean production score of quarterbacks in the three draft position groups. Identify each of the following elements for this study:
a. Response variable
b. Factor(s)
c. Treatments
d. Experimental units