Which notation is used to represent the number of scores in a sample?

The correct answer is indicative of the notation specifically utilized to denote the number of scores in a sample. In statistics, "n" represents the sample size or the count of observations within that sample. This notation helps researchers and statisticians distinguish between a sample and a population.

To clarify further, "N" typically represents the total number of scores in a population, not a sample. Consequently, using "N" could lead to confusion when referring to sample data. The symbols "X" and "Y" are often used to denote variables or individual scores in datasets rather than the number of scores. Therefore, "n" is the most accurate and accepted symbol for indicating the number of scores in a sample. This standardization in notation is critical in statistical practice for clear communication and understanding of data analyses.