I would like a full explain for the following questions, it will be the best if there are someone know R and screenshot the steps please. PLEASE DON'T COPY FROM CHEGG. Thank you. Q: Exposure to volatile organic compounds (VOC) which have been identified in indoor air is suspected as a cause for headaches and respiratory symptoms. Indoor plants have not only a positive psychological effects on humans, but may also improve the air quality. Certain species of indoor plants were found to be effective removers of VOCs. The following data gives the benzene level (in ppm) in 10 test chambers measured at the beginning of the study and after 3 days, using the plant Epipremnum aureum. Initial Benzene Level (x_i) & Benzene Level after 3 Days (y_i) 28.4 27.4 27.3 26.3 25.5 25.6 29.4 24.5 30.2 28.7 31.3 29.6 28.6 27.5 28.4 28.4 26.5 23.2 27.3 24.3 1. Use R to verify that the differences D_i = X_i Y_i, with i= 1, . . . , 10 satisfy the normality assumption. 2. Is there any evidence that this species of indoor plants is effective in removing the benzene from the indoor air? Use = 0.05 3. Justify your answer in 2) by constructing a 95% confidence interval for the mean difference.