Jltra high performance concrete (UHPC) is a relatively new construction material that is characterized by strong adhesive properties with other materials. The article "Adhesive Power of Ultra High Performance Concrete from a Thermodynamic Point of View"+ described an investigation of the intermolecular forces for UHPC connected to various substrates. The following work of adhesion measurements (in mJ/m²) for UHPC specimens adhered to steel appeared in the article. 107.1 109.5 107.4 106.8 108.1 (a) Is it plausible that the given sample observations were selected from a normal distribution? It's plausible that the distribution could be normal. O It's not plausible that the distribution could be normal. (b) Calculate a two-sided 95% confidence interval for the true average work of adhesion for UHPC adhered to steel. (Round your answer to two decimal places.) 7) m³/m² Does the interval suggest that 109 is a plausible value for the true average work of adhesion for UHPC adhered to steel? O The interval suggests that 109 is a possible value for the true average. The interval doesn't suggest that 109 is a possible value for the true average. Does the interval suggest that 112 is a plausible value for the true average work of adhesion for UHPC adhered to steel? O The interval suggests that 112 is a possible value for the true average. O The interval doesn't suggest that 112 is a possible value for the true average. (c) Predict the resulting work of adhesion value resulting from a single future replication of the experiment by calculating a 95% prediction interval. (Round your answers to two decimal places.) m³/m² Compare the width of this interval to the width of the CI from (b). The two intervals are the same width. o The PI is wider than the CI. O The CI is wider than the PI.

e) Consider the following model: Y = B + B,Y, + B,Z, +u; Assume that cov( Y,,u, )± 0 and cov(Z,,u, )=0. li> Explain in detail how you would test the relationship between the instrumental variable 2: and the endogenous regressor Y, .

4:20 1 .ll 4G ( Kartik Bro Template (GECO5113(5... •.. good X. b) What is the relationship between: i) Goods X and Y? ii) Goods X and Z? c) If you are the producer of good x and you want to increases your total revenue would you increase the price of RM3 per unit to RM4 per unit? Why? ( use the concepts of elasticity in your answer)?. Question 2: Accountants at the Renong and Khalid Accountant Company believed that several traveling executives were submitting unusually high travel vouchers when they returned from business trips. First, they took a sample of 200 vouchers submitted from the past year. Then they developed the following multiple-regression equation relating expected travel cost (Y) to number of days on the road (X,) and distance traveled (X,) in miles: Y = 90.00 + 48.50X, +0.40X, Here is additional information concerning the regression model: Sb, = 0.038 Sb, =0.019 R? 0.68 Se 1.63 F-Statistic 32.123 Durbin-Watson (d) statistic = 0.5436 a) Which of the independent variables…

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