Consider a least squares regression line given by Y = 5.25 + 2.3X, where = 2 and = 1.25. As a general rule-of-thumb, a manager can be 95 percent confident that the true value of the underlying parameter estimate, , is contained in which of the following intervals? A) [5.25-2x1.25, 5.25+2x1.25]. B) [5.25-2x2, 5.25+2x2]. C) [2.3-2x1.25, 2.3+2x1.25]. D) [2.3-2x2, 2.3+2x2]