Question

Question 4: In an experiment to determine the effect of ambient air temperature on the emissions of oxides of nitrogen (NOx) of diesel trucks, 10 trucks were run at temperatures of 40°F and 80°F. The order of the testing for a particular truck was randomized by the flip of a coin. The emissions in ppm (and some summary statistics) are presented in the table below. The qqplot for the paired difference is shown in the figure below. Truck 40F 80F Diference 0.835 0.815 0.020 0.753 0.765 0.012 3 0.856 0.843 0.013 4 0.901 0.797 0.104 5 0.785 0.764 0.021 0.863 0.820 0.043 7 0.883 0.784 0.099 8 0.740 0.695 0.046 9 0.748 0.773 -0.025 10 0.849 0,7950.054 q9plot for palired difference 4 mean 0.821 0.785 15 10 00510 sd 0.059 00410,042 Calculate the t-statistic to test for a difference between the mean emissions of trucks at 40°F versus 80"E A. B. Based on a two-sided alternative hypothesis and a-0.05, calculate the p-value. (no need to make a decision.) C. Is the t-test appropriate for this study? If not, what is the alternative test method we can use (6pts)

Answer 1