Question

Observations are taken on sales of a certain mountain bike in 21 sporting goods stores. The...

Observations are taken on sales of a certain mountain bike in 21 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 1,293.9     389.2           
  FloorSpace 11.088     1.63           
  Competing Ads -6.653     3.962           
  Price -0.14949     0.08342           

  

(b-1)

What is the critical value of Student's t in Appendix D for a two-tailed test at α = 0.01? (Round your answer to 3 decimal places.)

     

  t-value =
(b-2) Choose the correct option.
Only CompetingAds differs significantly from zero.
Only FloorSpace differs significantly from zero.
Only Price differs significantly from zero.
Math   Statistics-And-Probability   
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