25 Practice Questions

25 Practice Questions - Conclusion Ex Sales vs Ad \$ n = 5 8...

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Ex: Salary vs. Experience ( n = 50) 70 80 90 100 Salary = 11.3692 + 2.14131 Years S = 8.64229 R-Sq = 78.7 % R-Sq(adj) = 78.2 % Regression Plot 3 0 10 20 30 10 20 30 40 50 60 Years Salary Regression Analysis: Salary versus Years of Experience The regression equation is Salary = 11.4 + 2.14 Years Predictor Coef SE Coef T P Ex: Salary vs. Experience ( n = 50) 4 Constant 11.3690 3.1600 Years 2.1413 0.1608 S = 8.642 R-Sq = 78.7% R-Sq(adj) = 78.2%
Ex: Salary vs. Experience ( n = 50) H 0 : β 1 = 0 vs. H 1 : β 1 0 α = 0.05 df = Test Statistic: Conclusion: 5 t 0 .025 Reject Reject .025 95% Confidence Interval for β 1 : Ex: Salary vs. Experience ( n = 50) H 0 : β 0 = 0 vs. H 1 : β 0 0 α = 0.05 df = Test Statistic: Conclusion: 6 t 0 .025 Reject Reject .025 95% Confidence Interval for β 0 :

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Ex: Sales vs. Ad \$ ( n = 5) Regression Analysis: Sales versus Ad\$ The regression equation is Sales = - 0.100 + 0.700 Ad\$ 7 Predictor Coef SE Coef T P Constant -0.1000 0.6351 Ad\$ 0.7000 0.1915 S = 0.6055 R-Sq = 81.7% R-Sq(adj) = 75.6% H 0 : β 1 = 0 vs. H 1 : β 1 0 α = 0.05 df = Test Statistic:

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Unformatted text preview: Conclusion: Ex: Sales vs. Ad \$ ( n = 5) 8 t .025 Reject Reject .025 95% Confidence Interval for β 1 : H : β = 0 vs. H 1 : β ≠ α = 0.05 df = Test Statistic: Conclusion: Ex: Sales vs. Ad \$ ( n = 5) 9 t .025 Reject Reject .025 95% Confidence Interval for β : More Practice Regression Analysis: FuelCons versus Temp The regression equation is FuelCons = 15.8 - 0.128 Temp Predictor Coef SE Coef T P Ex: Fuel Consumption Case ( n = 8). Predicted FuelCons when Temp = 40. 10 Constant 15.8379 0.8018 19.75 0.000 Temp -0.12792 0.01746 -7.33 0.000 S = 0.654209 R-Sq = 89.9% R-Sq(adj) = 88.3% Predicted Values for New Observations New Obs Fit SE Fit 95% CI 95% PI 1 10.721 0.241 More Practice Ex: Fuel Consumption Case ( n = 8). Do the following for Temp = 40: Fitted FuelCons = 95% CI for mean FuelCons when Temp = 40: 11 Predicted FuelCons = 95% PI for FuelCons when Temp = 40:...
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25 Practice Questions - Conclusion Ex Sales vs Ad \$ n = 5 8...

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