Observations are taken on sales of a certain mountain bike in 25 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 "0" wherever required.Round your t-values to 3 decimal places and p-values to4 decimal places.)

(b-1) What is the critical value of Student's t in Appendix D for a two-tailed test at = .01? (Round your answer to 3 decimal places.)

(b-2) Choose the correct option. multiple choice

• Only CompetingAds differs significantly from zero.
• Only FloorSpace differs significantly from zero.
• Only Price differs significantly from zero.