Observations are taken on sales of a certain mountain bike in 30 sporting goods stores. The regression model was Y = total sales (thousands of dollars), X; = display floor space (square meters), X, = competitors' advertising expenditures (thousands of dollars), X3 = advertised price (dollars per unit). (a) Fill in the values in the table given here. (Negative values should be indicated by a minus sign. Leave no cells blank - be certain to enter "0" wherever required. Round your t-values to 3 decimal places and p-values to 4 decimal places.) Predictor Coefficient SE Leale p-value Intercept 1,225.4 397.3 FloorSpace 11.522 1.330 CompetingAds -6.935 3.805 Price -0.14855 0.08927 (b-1) What is the critical value of Student's tin Appendix D for a two-tailed test at a = .01?7 (Round your answer to 3 decimal places.) (b-2) Choose the correct option. O Only Price differs significantly from zero. O Only FloorSpace differs significantly from zero. O Only CompetingAds differs significantly from zero