A random sample of 502 Vail Resorts' guests were asked to rate their satisfaction on various attributes of their visit on a scale of 1­5 with 1 = very unsatisfied and 5 = very satisfied. The regression model was Y = overall satisfaction score, X1 = lift line wait, X2 = amount of ski trail grooming, X3 = ski patrol visibility, and X4 = friendliness of guest services.
(a) Calculate the t statistic for each coefficient to test for βj = 0.
(b) Look up the critical value of Student's t in Appendix D for a two-tailed test at α = .01. Which coefficients differ significantly from VailGuestSat2 zero?
(c) Use Excel to find a p-value for each coefficient.

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Predictor Coefficient SE intercept LiftWait AmountGroomed SkiPatroVisibility FriendlinessHosts 2.8931 0.1542 0.2495 0.0539 -0.1196 0.3680 0.0440 0.0529 0.0443 0.0623