Suppose television advertisers want to know if age plays a role in people's response to a rather unconventional ad that might be aired during the next Super Bowl. The ad is shown to a variety of viewers. Keeping in mind that the explanatory variable is not necessarily the first one mentioned, classify each of the following possible approaches as involving one of these relationships:
C → C: categorical explanatory variable and categorical response variable
C → Q: categorical explanatory variable and quantitative response variable
Q → C: quantitative explanatory variable and categorical response variable
Q → Q: quantitative explanatory variable and quantitative response variable
a. They ask whether or not a viewer likes the ad, and record his or her age.
b. They classify a viewer as being youth, young adult, middle-aged, or senior citizen, and whether or not he or she likes the ad.
c. Viewers' ages are recorded, along with their rating of the ad on a scale of 1 (most unfavorable) to 10 (most favorable).
d. Viewers' ratings of the ad on a scale of 1 to 10 are recorded, along with the viewers' age group as being youth, young adult, middle-aged, or senior citizen.