https://drive.google.com/file/d/1we2_n-bm2akoofvkiFOMWtbMNZ-ufJGL/view?usp=sharing

PART A 1 The manufacturer of an Engine Energizer System (EES) claims that it improves gas mileage and reduces emissions in automobiles by using magnetic-free energy to increase the amount of oxygen in the fuel for greater combustion efficiency. Following are test results, performed under international and U.S. government agency standards, on a random sample of 14 vehicles. The data (also see file M09_Gas_Paired.txt or M09_Gas_Q7.xisx) give the carbon monoxide (CO) levels, in parts per million, of each vehicle tested, both before installation of EES and after installation. Before After 1.60 0.15 0.30 0.20 3.80 2.80 6.20 3.60 3.60 1.00 1.50 0.50 2.00 1.60 2.60 1.60 0.15 0.06 0.06 0.16 0.60 0.35 0.03 0.01 0.10 0.00 0.19 0.00 (a)Test at the 1% significance level whether, on average, EES reduces CO emissions. (b)Obtain a 99% confidence interval for the difference between the mean CO emissions before and after installation of EES corresponding to the test in part (a). (c)Interpret the confidence interval obtained in part (b). Does this interval support the conclusion of the hypothesis test in part (a)? PART B (use R commander for following questions) 3. Refer Question 1 in Part A. The data are provided in the data file M09_Gas_Q7.xIsx (a)Use the proper graphical tools in R and R commander to assess whether it is reasonable to apply the procedure you chose in Question 1 (a). Make sure