題組內容

(4) The following results were obtained from a multiple regression analysis of supermarket profitability. The dependent variable, y, is the profit (in thousands of dollars) and the independent variables, x1 and x2, are the food sales and nonfood sales (also in thousands of dollars).(20%)

d. Carry out a test to determine if there is a significant relationship between \( x_{1} \) and \( y \). Use a .05 level of significance.