Final answer:
The abbreviation used to denote the number of subjects in a specific treatment group is 'n', and it represents the sample size of that group in the study.
Step-by-step explanation:
The abbreviation used to represent the number of subjects within a particular treatment condition in a study is n. It stands for the sample size or the total number of experimental units in one group that receives a specific level of the treatment.
Using the provided information:
- The population is all college students.
- The sample is the 100 college students in the study.
- The experimental units are each individual college student who participated.
- The explanatory variable is the size of the tableware.
- The treatment is tableware that is 20 percent smaller than normal.
- The response variable is the amount of food eaten.