Linear Regression & Least Squares Method: Videos & Practice Problems

In a study involving linear regression, we often work with individual data points. Each data point consists of an $x$-value and a corresponding $y$-value. Suppose you are analyzing the actual value of the response variable that corresponds to a specific value of the explanatory variable in the dataset. Which of the following symbols represents the actual $y$-value of a data point that corresponds to a given $x$-value?