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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), X1 = display floor space (square meters), X2 = competitors' advertising expenditures (thousands of dollars), X3 =advertised price (dollars per unit). Click here for the Excel Data File (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 tcalc p-value Intercept 1,225.4 397.3 3.0843 0.0048 FloorSpace 11.522 1.330 8.6632 3.8486 Competing Ads -6.935 3.905 -1.7759 0.0875 Price -0.14955 0.08927 -1.6753 0. 1059 (b-1) What is the critical value of Student's t in Appendix D for a two-tailed test at a = .01? (Round your answer to 3 decimal places.) t-value = 2.779 (b-2) Choose the correct option. Only FloorSpace differs significantly from zero. Only CompetingAds differs significantly from zero. Only Price differs significantly from zero. JUN 19 ec6372cb A MacBook