Final answer:
The correct answer is A) Best-fit regression line. The least-squares line is a line that is drawn on a scatter plot to represent the relationship between two variables. It can be used to make predictions about height based on pinky finger length.
Step-by-step explanation:
The correct answer is A) Best-fit regression line.
The least-squares line, also known as the best-fit regression line, is a line that is drawn on a scatter plot to represent the relationship between two variables. In this case, the independent variable is pinky finger length (x) and the dependent variable is height (y). By using the least-squares method, we can find the equation of the best-fit line that minimizes the sum of the squared errors. This line can then be used to make predictions about height based on pinky finger length.
According to your equation, the predicted height for a pinky length of 2.5 inches can be calculated by substituting x=2.5 into the equation and solving for y.