Observations are taken on sales of a certain mountain bike in 22 sporting goods stores. The regression model was Y= total sales (thousands of dollars), X1= display floor space (square meters), X2= 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 " O wherever required. Round your t values to 3 decimal places and p-values to 4 decimal places.) (b-1) What is the critical value of Student's t in Appendix. D for a two-talled test at a=.01 ? (Round your answer to 3 decimal places.) (b-2) Choose the correct option. Only Price differs significantly from zero. (b-2) Choose the correct option. Only Price differs significantly from zero. Only CompetingAds differs significantly from zero. Only FloorSpace differs significantly from zero