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Use the inrannatron below to answer the questions for the 4.2 Assessment. In a study to examine the relationship between the time required to complete a construction project and several pertinent independent variables, an analyst compiled a list of four variables that might be useful in predicting the time to completion. These four variables were size of the contract, X1 (in $1000 units), number of workdays adversely affected ty the weather X2, a variable X3 that indicates the presence (X3 = 1) or absence (X3 = U) of a workers' strike and number of subcontractors involved in the project X4. Fifteen construction projects were randomly chosen and each of the four variables as well as the time to completion were measured. Y X1 X2 X3 X4 29 60 7 0 7 15 80 10 (l 60 100 8 1 10 10 50 14 O 5 70 200 12 1 11 15 50 4 0 3 75 500 15 1 12 30 75 5 0 6 45 750 10 (l 10 90 1200 20 1 12 7 70 5 (l 3 21 80 3 (l 5 28 300 6 0 a 50 2600 14 1 13 30 110 7 (l 4 The SAS output is given here and then you are to answer the questions below using this SAS output only and no rounding is allowed. Linear Regression Results: End of Chapter 4 Assessment Linear Regression Results: End of Chapter 4 Assessment The REG Procedure Model: Linear_Regression_Model Dependent Variable: Y Number of Observations Read 15 Number of Observations Used 15 Analysis of Variance Source DF Sum of Squares Mean Square F Value Pr > F Model 4 7770.29715 1942.57429 13.85 0.0004 Error 10 1403.03618 140.30362 Corrected Total 14 9173.33333 Root MSE 11.84498 R-Square 0.8471 Dependent Mean 38.33333 Adj R-Sq 0.7859 Coeff Var 30.89996 Parameter Estimates Variable Label DF Parameter Standard t Value Pr > It| 95% Confidence Estimate Error Limits Intercept Intercept -1.58870 11.65559 -0.14 0.8943 -27.55897 24.38157 X1 ize 0.00784 0.00623 -1.26 0.2367 -0.02172 0.00604 X2 weather 0.67533 0.99978 0.68 0.5147 -1.55232 2.90297 X3 strike 28.01342 11.37143 2.46 0.0335 2.67630 53.35054 X4 subcontractors 1 3.48887 1.93516 7.80 01.1016 -0.82293 7.80068Y X1 X2 X3 X4 predicted Y 29 50 7 0 7 27.0901 15 80 10 0 8 32.4481 60 100 8 1 10 55.9318 10 50 14 0 5 24.9181 70 200 12 1 11 71.3377 15 50 4 0 3 11.1871 75 500 15 1 12 74.4998 30 75 5 0 5 22.1330 45 750 10 0 10 34.1714 90 1200 20 1 12 72.3857 7 70 5 0 3 11.7056 21 80 3 0 5 20.7431 28 300 8 0 8 29.3721 50 2500 14 1 13 50.8440 30 110 7 0 4 16.2314 CHAPTER 4.2 ASSESSMENT 1. Using the material above, please select the correct answer for each item. ' S Squared ' CHAPTER 4.2 ASSESSMENT 1. Using the material above, please select the correct answer for each item. SSE = a. 0.8471 S Squared = b. 1403.03618 S = C. 140.30362 R Squared = d. 11.84498 SAVE VIEW CORRECT ANSWER 2. The 95% Cl for B3. O (-0.02172, 0.00604) O (-1.55232, 2.90297) O (2.67630, 53.35054) O none of these SAVE VIEW CORRECT ANSWER3. The test statistic value for testing X4 as being significant to model is? O-0.14 O-1.26 0 0.68 0 13.85 O none of these SAVE VIEW CORRECT ANSWER 4. In reference to the previous question, what is the correct decision? Reject Ho or do not reject Ho? O Reject O Do not reject SAVE VIEW CORRECT
