Answer:
In simple words, Categorical: brand image (classifications are different brands); prototype (classifications are various patterns); type of freezer (classifications are next to each other, top , bottom); what is or isn't compliant with energy star (classifications seem to be yes or no).
Quantitative: width (inch); diameter (inch); length (inch); total capacity of refrigerator (cubic feet); aggregate capacity of fridge (cubit feet);
The persons included in the study are fridges.