Table 1 shows the carbon monoxide [(30] measurements in Shah Mam air during 9am and 5pm for a randomly selected 10 days. Measurement are parts per million. The objective of the study is to see whether the CO concentrations at Sam is different from 5pm. Table 1 a} Calculate the mean and standard deviation of CD concentrations for both hours. b} Assuming population variances are equal conduct an appropriate test to test whether there is a significant different of (20 concentrations between 9am and 5pm at :1 = 0.05. c] Based on your answers in {a} and lb] summarize the different levels of (:0 concentrations between the two hours