Whether by design, accident, or necessity, the number of subjects in each of the conditions in an experiment may not be equal. Since n is used to refer to the sample size of an individual group, desi...Whether by design, accident, or necessity, the number of subjects in each of the conditions in an experiment may not be equal. Since n is used to refer to the sample size of an individual group, designs with unequal sample sizes are sometimes referred to as designs with unequal n. Table 1. Sample Sizes for "Bias Against Associates of the Obese" Study.