# Question

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).

(a) Calculate the t statistic for each coefficient to test for β = 0.

(b) Look up the critical value of Student's t in Appendix D for a two-tailed test at α = .01. Which coefficients Bikes differ significantly from zero?

(c) Use Excel to find the p-value for each coefficient.

(a) Calculate the t statistic for each coefficient to test for β = 0.

(b) Look up the critical value of Student's t in Appendix D for a two-tailed test at α = .01. Which coefficients Bikes differ significantly from zero?

(c) Use Excel to find the p-value for each coefficient.

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