This document discusses different types of data and attributes that can be measured in a study about snack foods. It defines nominal, ordinal, interval, and ratio data, and describes the differences between them. It also defines quantitative and qualitative attributes, and provides examples of attributes that could be measured in a snack food study, such as mass, heat, and distance. Finally, it defines populations and samples, and provides some examples of possible populations for testing, such as teenagers and urban residents.