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Observations are taken on sales of a certain mountain bike in 28 sporting goods stores. The...

Observations are taken on sales of a certain mountain bike in 28 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 to 4 decimal places.)

Predictor Coefficient SE tcalc p-value
Intercept 1,280.7 385.1 Not attempted Not attempted
FloorSpace 11.135 1.66 Not attempted Not attempted
Competing Ads -6.667 3.981 Not attempted Not attempted
Price -0.14503 0.08327 Not attempted

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

t-value =

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