Exhibit 1-1. A malkiple linear regression was used to stody how family spending (y) is influenced by income (x1), family size (x2), and additions to savines (x3). The variabler y3x1, and x3 ate measured in thousands of dollars per year. The following results were obeained. Refer to Exhibit 1 -1. The estimated standard deviation of the error term in the regression model (standard error of the estimate) is a. 2.04 b. 4.06 c. 1.65 d. 1.75